90811992 has 32 divisors (see below), whose sum is σ = 234860400. Its totient is φ = 29226624.

The previous prime is 90811967. The next prime is 90811997. The reversal of 90811992 is 29911809.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 90811992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90811997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64543 + ... + 65934.

Almost surely, 2^90811992 is an apocalyptic number.

It is an amenable number.

90811992 is an abundant number, since it is smaller than the sum of its proper divisors (144048408).

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

90811992 is a wasteful number, since it uses less digits than its factorization.

90811992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130515 (or 130511 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 90811992 is about 9529.5326223273. The cubic root of 90811992 is about 449.4841694282.

The spelling of 90811992 in words is "ninety million, eight hundred eleven thousand, nine hundred ninety-two".