90 (number)


90 (number)

90 (ninety) is the natural number preceded by 89 and followed by 91.

90

0 10 20 30 40 50 60 70 80 90

Cardinal ninety
Ordinal 90th
(ninetieth)
Numeral system 90
Factorization 2 \cdot 3^2 \cdot 5
Divisors 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Roman numeral XC
Binary 10110102
Octal 1328
Duodecimal 7612
Hexadecimal 5A16
Interstate 90 is a freeway that runs from Washington to Massachusetts.

Contents

In mathematics

  • 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. 90 is a pronic number. But it is also a nontotient. It is a Perrin number, preceded in the sequence by 39, 51, 68.
  • 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.[1] Thus, an angle measuring 90 degrees is called a right angle.[2]
  • 90 is divisible by the sum of its base 10 digits, thus it is a Harshad number.

In science

In religion

Ninety of the Psalm are credited to Moses; some credit the ninety-first psalm to him as well.

In sports

  • Nike Total 90 Apparel is a brand name of football apparel and football equipment from equipment bags to goalkeeper gloves
  • Major League baseball bases are 90 feet (27 m) away in distance
  • The car number most associated with former NASCAR team owner Junie Donlavey
  • The number of minutes in a football (soccer) match.

In Wellness Plans

  • P90X is a rigorous work out plan for 90 days with proclaimed incredible results.

See also

References

  1. ^ http://www.sparknotes.com/testprep/books/newsat/chapter20section4.rhtml
  2. ^ Friedman, Erich. What's Special About This Number?

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