90156972 has 18 divisors (see below), whose sum is σ = 210443044. Its totient is φ = 30041360.

The previous prime is 90156961. The next prime is 90156973. The reversal of 90156972 is 27965109.

It is a self number, because there is not a number n which added to its sum of digits gives 90156972.

It is not an unprimeable number, because it can be changed into a prime (90156973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 31522 + ... + 34262.

Almost surely, 2^90156972 is an apocalyptic number.

It is an amenable number.

90156972 is an abundant number, since it is smaller than the sum of its proper divisors (120286072).

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

90156972 is an equidigital number, since it uses as much as digits as its factorization.

90156972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 90156972 is about 9495.1025270926. The cubic root of 90156972 is about 448.4008622441.

The spelling of 90156972 in words is "ninety million, one hundred fifty-six thousand, nine hundred seventy-two".