91995992 has 16 divisors (see below), whose sum is σ = 188173800. Its totient is φ = 41816320.

The previous prime is 91995989. The next prime is 91996001. The reversal of 91995992 is 29959919.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 522617 + ... + 522792.

Almost surely, 2^91995992 is an apocalyptic number.

It is an amenable number.

91995992 is an abundant number, since it is smaller than the sum of its proper divisors (96177808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91995992 is a wasteful number, since it uses less digits than its factorization.

91995992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045426 (or 1045422 counting only the distinct ones).

The product of its digits is 590490, while the sum is 53.

The square root of 91995992 is about 9591.4541129070. The cubic root of 91995992 is about 451.4291878201.

The spelling of 91995992 in words is "ninety-one million, nine hundred ninety-five thousand, nine hundred ninety-two".