31971608764 has 6 divisors (see below), whose sum is σ = 55950315344. Its totient is φ = 15985804380.

The previous prime is 31971608761. The next prime is 31971608771. The reversal of 31971608764 is 46780617913.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31971608761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3996451092 + ... + 3996451099.

Almost surely, 2^31971608764 is an apocalyptic number.

It is an amenable number.

31971608764 is a deficient number, since it is larger than the sum of its proper divisors (23978706580).

31971608764 is a wasteful number, since it uses less digits than its factorization.

31971608764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7992902195 (or 7992902193 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 31971608764 in words is "thirty-one billion, nine hundred seventy-one million, six hundred eight thousand, seven hundred sixty-four".