30 (number)

30 (thirty) is the natural number following 29 and preceding 31.

From 1 to the number 30, this is the longest Aliquot Sequence.

, 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).