# 90 (number)

## Natural number / From Wikipedia, the free encyclopedia

**90** (**ninety**) is the natural number following 89 and preceding 91.

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*in Wiktionary, the free dictionary.***ninety****Quick Facts**← 89 90 91 →, Cardinal ...

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Cardinal | ninety | |||

Ordinal | 90th (ninetieth) | |||

Factorization | 2 × 3^{2} × 5 | |||

Divisors | 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 | |||

Greek numeral | Ϟ´ | |||

Roman numeral | XC | |||

Binary | 1011010_{2} | |||

Ternary | 10100_{3} | |||

Senary | 230_{6} | |||

Octal | 132_{8} | |||

Duodecimal | 76_{12} | |||

Hexadecimal | 5A_{16} | |||

Armenian | Ղ | |||

Hebrew | צ / ץ | |||

Babylonian numeral | 𒐕𒌍 | |||

Egyptian hieroglyph | 𓎎 |

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In the English language, the numbers 90 and 19 are often confused, as they sound very similar. When carefully enunciated, they differ in which syllable is stressed: 19 /naɪnˈtiːn/ vs 90 /ˈnaɪnti/. However, in dates such as 1999, and when contrasting numbers in the teens and when counting, such as 17, 18, 19, the stress shifts to the first syllable: 19 /ˈnaɪntiːn/.