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# 90

Number 90 (ninety) is an even two-digits composite number and natural number following 89 and preceding 91.

## Properties of the number 90

 Nominal 90 Cardinal ninety Ordinal 90th Number of digits 2 Sum of digits 9 Product of digits 0 Number parity Even
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## Prime Factorization of 90

 Prime factorization 2 x 3 x 3 x 5 Prime factorization in exponent form 2 x 32 x 5 Prime factors 2, 3, 5 Number of distinct prime factors ω(n) 3 Total number of prime factors Ω(n) 4 Sum of prime factors 10 Product of prime factors 30
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## Divisors of 90

 List of proper divisors 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45 List of all dividers 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90 Number of divisors d(n) 12 Sum of all divisors σ(n) 234 Aliquot sum 144 90 is an abundant number , because the sum of its proper divisors (144) is greater than itself. Its abundance is 54.
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## Prime numbers

 Is 90 a prime number? No Is 90 a semiprime number? No Is 90 a Chen prime number? No Is 90 a Mersenne prime number? No
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## Sequences

 Is 90 a Catalan number? No Is 90 a Fibonacci number? No Is 90 a Idoneal number? No
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## Number theory

Number theory is a branch of pure mathematics devoted primarily to the study of the integers and integer-valued functions.
 90 is not a Happy number 90 is a Humble number 90 is not a Münchhausen number 90 is not a Perfect number 90 is not a Perfect square 90 is not a Palindrome
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## Numeric Bases of 90

In mathematics, a base or radix of a numeral system is the number of unique digits, including zero, used to represent numbers in that system.
BaseSystemValue
2Binary10110102
3Ternary101003
4Quaternary11224
5Quinary3305
6Senary2306
7Septenary1567
8Octal1328
9Nonary1109
10Decimal90
12Duodecimal7612
20Vigesimal4a20
36Base362i36
60Sexagesimal1U60
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## Mathematical operations

Mathematical operations are actions that are performed on numbers or mathematical expressions to find a numerical result.
 Square of 90 (n2) 8100 Cube of 90 (n3) 729000 Square root of 90 9.48683 Natural Logarithm (ln) of 90 4.49981 Decimal Logarithm (log) of 90 1.95424
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## Trigonometry

Trigonometry is the study of the relationship between the angles and sides of a triangle.
 Sine of 90 0.893997 Cosecant of 90 1.11857 Cosine of 90 -0.448074 Secant of 90 -2.23178 Tangent of 90 -1.9952 Cotangent of 90 -0.501203
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## Number parity

Parity is the property of an integer of whether it is even or odd.

### Is 90 an Even Number?

Yes, the number 90 is an even number.

### Is 90 an Odd Number?

No
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## Ban number

In recreational mathematics, a ban number is a number that does not contain a particular letter when spelled out in English; in other words, the letter is "banned".
 The spelling of 90 in words is "ninety", meaning that: 90 is an aban number (a number without the letter a) 90 is not an eban number (as it contains the letter e) 90 is not an iban number (as it contains the letter i) 90 is an oban number (a number without the letter o) 90 is not a tban number (as it contains the letter t) 90 is an uban number (a number without the letter u)
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## Numeral systems

How to write 90 in other number systems?
 Bengali numerals ৯০ Eastern Arabic numerals ٩٠ Hieroglyphs numeralsused in Ancient Egypt 𓎎 Khmer numerals ៩០ Japanese numerals 九十 Roman numerals XC Thai numerals ๙๐
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## Translation

How do you say 90 in 38 different languages?
 Arabic تسعون Croatian devedeset Czech devadesát Danish halvfems Dutch negentig Estonian blaasieke Faroese níti Filipino siyám na pû Finnish yhdeksän­kymmentä French quatre-vingt-dix Greek εννενήντα German neunzig Hebrew תשעים Hindi नब्बे Hungarian kilencven Icelandic níutíu Indonesian sembilan puluh Italian novanta Japanese 九十 Korean 구십 Latvian deviņdesmit Lithuanian devyniasdešimt Norwegian nitti Persian نود Polish dziewięćdziesiąt Portuguese noventa Romanian nouăzeci Russian девяносто Serbian деведесет Slovak deväťdesiat Slovene devetdeset Spanish noventa Swahili tisini Swedish nittio Thai เก้า​สิบ Turkish doksan Ukrainian девʼяносто Vietnamese chín mươi
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## Miscellaneous

 Number 90 reversed 09 ASCII Code 90 Z Unicode Character U+005A Z Unix Timestamp Thu, 01 Jan 1970 00:01:30 +0000
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