90811956 has 12 divisors (see below), whose sum is σ = 211894592. Its totient is φ = 30270648.

The previous prime is 90811939. The next prime is 90811967. The reversal of 90811956 is 65911809.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×90811956² = 16493622705091872, which contains 22 as substring.

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, 3783820 + ... + 3783843.

Almost surely, 2^90811956 is an apocalyptic number.

It is an amenable number.

90811956 is an abundant number, since it is smaller than the sum of its proper divisors (121082636).

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

90811956 is a wasteful number, since it uses less digits than its factorization.

90811956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7567670 (or 7567668 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 90811956 is about 9529.5307334622. The cubic root of 90811956 is about 449.4841100329.

The spelling of 90811956 in words is "ninety million, eight hundred eleven thousand, nine hundred fifty-six".