31188993864 has 64 divisors (see below), whose sum is σ = 89142211200. Its totient is φ = 8908061184.

The previous prime is 31188993859. The next prime is 31188993911. The reversal of 31188993864 is 46839988113.

It is a junction number, because it is equal to n+sod(n) for n = 31188993798 and 31188993807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479652 + ... + 540780.

It is an arithmetic number, because the mean of its divisors is an integer number (1392847050).

Almost surely, 2^31188993864 is an apocalyptic number.

It is an amenable number.

31188993864 is an abundant number, since it is smaller than the sum of its proper divisors (57953217336).

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

31188993864 is a wasteful number, since it uses less digits than its factorization.

31188993864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64182 (or 64178 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 60.

The spelling of 31188993864 in words is "thirty-one billion, one hundred eighty-eight million, nine hundred ninety-three thousand, eight hundred sixty-four".