90972172356 has 48 divisors (see below), whose sum is σ = 228778804800. Its totient is φ = 27969144192.

The previous prime is 90972172351. The next prime is 90972172391. The reversal of 90972172356 is 65327127909.

It is a super-2 number, since 2×90972172356² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90972172299 and 90972172308.

It is not an unprimeable number, because it can be changed into a prime (90972172351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35191 + ... + 427998.

It is an arithmetic number, because the mean of its divisors is an integer number (4766225100).

Almost surely, 2^90972172356 is an apocalyptic number.

It is an amenable number.

90972172356 is an abundant number, since it is smaller than the sum of its proper divisors (137806632444).

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

90972172356 is a wasteful number, since it uses less digits than its factorization.

90972172356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464468 (or 464466 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 51.

The spelling of 90972172356 in words is "ninety billion, nine hundred seventy-two million, one hundred seventy-two thousand, three hundred fifty-six".