31907631864 has 16 divisors (see below), whose sum is σ = 79769079720. Its totient is φ = 10635877280.

The previous prime is 31907631853. The next prime is 31907631883. The reversal of 31907631864 is 46813670913.

It is a happy number.

It is a super-2 number, since 2×31907631864² (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 3 ways as a sum of consecutive naturals, for example, 664742307 + ... + 664742354.

Almost surely, 2^31907631864 is an apocalyptic number.

It is an amenable number.

31907631864 is an abundant number, since it is smaller than the sum of its proper divisors (47861447856).

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

31907631864 is a wasteful number, since it uses less digits than its factorization.

31907631864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329484670 (or 1329484666 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 31907631864 in words is "thirty-one billion, nine hundred seven million, six hundred thirty-one thousand, eight hundred sixty-four".