30 (thirty) is the natural number following 29 and preceding 31.
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Cardinal | thirty | |||
Ordinal | 30th (thirtieth) | |||
Factorization | 2 × 3 × 5 | |||
Divisors | 1, 2, 3, 5, 6, 10, 15, 30 | |||
Greek numeral | Λ´ | |||
Roman numeral | XXX | |||
Binary | 111102 | |||
Ternary | 10103 | |||
Senary | 506 | |||
Octal | 368 | |||
Duodecimal | 2612 | |||
Hexadecimal | 1E16 | |||
Armenian | Լ | |||
Hebrew | ל | |||
Babylonian numeral | 𒌍 | |||
Egyptian hieroglyph | 𓎐 |
30 is an even, composite, pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and the first sphenic number, the smallest of the form , where r is a prime greater than 3. It has an aliquot sum of 42, which is the second sphenic number.
It is also:
Furthermore,
In a group G, such that , where p does not divide m, and has a subgroup of order , 30 is the only number less than 60 that is neither a prime nor of the aforementioned form. Therefore, 30 is the only candidate for the order of a simple group less than 60, in which one needs other methods to specifically reject to eventually deduce said order.[citation needed]
The SI prefix for 1030 is Quetta- (Q), and for 10−30 (i.e., the reciprocal of 1030) quecto (q). These numbers are the largest and smallest number to receive an SI prefix to date.
Thirty is: