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Encyclopedia > 90 (number)

90 (ninety) is the natural number preceded by 89 and followed by 91. A natural number is either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). The former definition is generally used in number theory, while the latter is preferred in set theory and computer science. ... 89 (eighty-nine) is the natural number following 88 and preceding 90. ... 91 is the natural number following 90 and preceding 92. ...

 << 90 91 92 93 94 95 96 97 98 99 >> 89 (eighty-nine) is the natural number following 88 and preceding 90. ... 91 is the natural number following 90 and preceding 92. ... 92 is the natural number following 91 and preceding 93. ... 93 is the natural number following 92 and preceding 94. ... 94 (ninety-four) is the natural number following 93 and preceding 95. ... 95 is the natural number following 94 and preceding 96. ... 96 is the natural number following 95 and preceding 97. ... 97 is the natural number following 96 and preceding 98. ... 98 is the natural number following 97 and preceding 99. ... 99 (ninety-nine) is the natural number following 98 and preceding 100. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ... List of numbers -- Integers This is a list of articles about numbers (not about numerals). ... The integers consist of the positive natural numbers (1, 2, 3, â€¦), their negatives (âˆ’1, âˆ’2, âˆ’3, ...) and the number zero. ... 0 10 20 30 40 50 60 70 80 90 >> 0 (zero), alternatively called naught, nil, nada, ought, zilch, zip, nothing or nought, is both a number and a numeral. ... 10 (ten) is the natural number following 9 and preceding 11. ... 20 (twenty) is the natural number following 19 and preceding 21. ... 30 (thirty) is the natural number following 29 and preceding 31. ... 40 (forty) is the natural number following 39 and preceding 41. ... 50 (fifty) is the number following 49 and preceding 51. ... 60 (sixty) is the natural number following 59 and preceding 61. ... 70 (seventy) is the natural number following 69 and preceding 71. ... 80 (eighty) is the natural number following 79 and preceding 81. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ... Cardinal 90 ninety Ordinal 90th ninetieth Factorization $2 cdot 3^2 cdot 5$ Divisors 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 Roman numeral XC Binary 1011010 Hexadecimal 5A Hebrew צ (Tsadi)

In linguistics, cardinal numbers is the name given to number words that are used for quantity (one, two, three), as opposed to ordinal numbers, words that are used for order (first, second, third). ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... In mathematics and computer science, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0â€“9 and Aâ€“F or aâ€“f. ... The Modern Hebrew language is a Semitic language of the Afro-Asiatic language family. ...

90 is the sum of the squares of the integers 2 to 6. Because 90 is the sum of its unitary divisors (excluding itself), it is a unitary perfect number. 90 is a pronic number. And because 90 is divisible by the sum of its digits in base 10, it is a Harshad number. But it is also a nontotient. The integers consist of the positive natural numbers (1, 2, 3, â€¦), their negatives (âˆ’1, âˆ’2, âˆ’3, ...) and the number zero. ... A unitary perfect number is an integer which is the sum of its positive proper unitary divisors, not including the number itself. ... A pronic number, or oblong number or heteromecic number, is a number which is the product of two consecutive nonnegative integers, that is, n(n + 1). ... A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ... A nontotient is a positive integer n which is not in the range of Eulers totient function φ, that is, for which φ(x) = n has no solution. ...

In normal space, the interior angles of a square measure 90 degrees each. Also, in a right triangle, the angle opposing the hypotenuse measures 90 degrees, with the other two angles adding up to 90 for a total of 180 degrees.

## In astronomy

Table of all 110 Messier objects. ... The Spiral Galaxy M90 (also known as Messier Object 90, Messier 90, M90, or NGC 4569) is a spiral galaxy in the Virgo constellation. ... The apparent magnitude (m) of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object. ... A spiral galaxy is a type of galaxy in the Hubble sequence which is characterized by the following physical properties: Spiral Galaxy M74 presents a face-on view of its spiral arms. ... Pierce this website is not very reliable!!!!!!!!!!!!!!!!! Some well-known constellations contain striking and familiar patterns of bright stars. ... See VIRGO (physics) for a French-Italian project in physics. ... The New General Catalogue (NGC) is the most well-known catalogue of deep sky objects in amateur astronomy. ... NGC 1300, viewed nearly face-on. ... Andromeda is a constellation named for the princess Andromeda (which is Greek for Ruler over men), a character in Greek mythology. ... A Saros cycle is a period of 6585 + 1/3 days (approximately 18 years 10 days and 8 hours) which can be used to predict eclipses of the sun and the moon. ... Photo taken during the French 1999 eclipse 29 March 2006 solar eclipse A solar eclipse occurs when the Moon passes in front of the Sun and obscures it totally or partially. ... Centuries: 3rd century BC - 2nd century BC - 1st century BC Decades: 180s BC 170s BC 160s BC 150s BC 140s BC - 130s BC - 120s BC 110s BC 100s BC 90s BC 80s BC Years: 139 BC 138 BC 137 BC 136 BC 135 BC - 134 BC - 133 BC 132 BC... September 28 is the 271st day of the year in the Gregorian calendar (272nd in leap years). ... Events Miracle of the Host Births October 31 - King Fernando I of Portugal (died 1383) AgnÃ¨s of Valois, daughter of John II of France (died 1349) Eleanor Maltravers, English noblewoman (died 1405) Deaths April 14 - Richard Aungerville, English writer and bishop (born 1287) September 16 - John IV, Duke of... March 4 is the 63rd day of the year in the Gregorian Calendar (64th in leap years). ... An eclipse refers to the phenomenon of one body passing into the shadow cast by another body. ... For other uses, see number 150. ... June 27 is the 178th day of the year (179th in leap years) in the Gregorian calendar, with 187 days remaining. ... // Events May 23 - Joan of Arc is captured by the Burgundians while leading an army to relieve CompiÃ¨gne The Ottoman Empire captures Thessalonica from the Venetians First use of optical methods in the creation of Art A map of Europe in 1430. ... August 4 is the 216th day of the year in the Gregorian Calendar (217th in leap years), with 149 days remaining. ...

## In other fields

Ninety is: Image File history File links Interstate_90. ... Image File history File links Interstate_90. ... Interstate 90 (abbreviated I-90) is the longest interstate highway in the United States at over 3,000 miles (4,800 kilometers). ...

Results from FactBites:

 90 (number) - Wikipedia, the free encyclopedia (382 words) 90 (ninety) is the natural number preceded by 89 and followed by 91. 90 is the sum of the squares of the integers 2 to 6. Because 90 is the sum of its unitary divisors (excluding itself), it is a unitary perfect number, and because it is equal to the sum of a subset of its divisors, it is a semiperfect number.
 Precision in Fortran 90 (1485 words) In Fortran 90, this precision is referred to using the symbol p, which indicates the minimum number of decimal digits which can be stored. In Fortran 90, the decimal size of a real number is referred to with the symbol, r, for the range of the number. For all permissible kinds of integers, determine the number of binary bits used to represent the numbers.
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