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Ninety

90 (ninety) is the natural number preceded by eighty-nine and followed by ninety-one.

90
Cardinal ninety
Ordinal ninetieth
Numeral system
Factorization
Roman numeral XC
Binary 1011010
Hexadecimal 5A

Mathematics

It is the sums of the squares of the integers 2 to 6, as well as a composite number, with its divisors being 1, 2, 3, 5, 6, 9, 15, 18, 30 and 45, and its factorization is

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.

Other fields

Ninety is:

The atomic number of thorium, an actinide.
The designation of American Interstate 90, a freeway that runs from Washington to Massachusetts.
The code for international direct dial phone calls to Turkey.
The year AD 90.

89 and 91

Referenced By

English-language numerals | English language numerals | Number 720 | Seven hundred twenty

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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ninety".