31900028892 has 24 divisors (see below), whose sum is σ = 74710112400. Its totient is φ = 10593812736.

The previous prime is 31900028887. The next prime is 31900028939. The reversal of 31900028892 is 29882000913.

It is a super-2 number, since 2×31900028892² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4937917 + ... + 4944372.

It is an arithmetic number, because the mean of its divisors is an integer number (3112921350).

Almost surely, 2^31900028892 is an apocalyptic number.

It is an amenable number.

31900028892 is an abundant number, since it is smaller than the sum of its proper divisors (42810083508).

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

31900028892 is a wasteful number, since it uses less digits than its factorization.

31900028892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9882565 (or 9882563 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 31900028892 in words is "thirty-one billion, nine hundred million, twenty-eight thousand, eight hundred ninety-two".