31977927968 has 24 divisors (see below), whose sum is σ = 71950338432. Its totient is φ = 13704826176.

The previous prime is 31977927967. The next prime is 31977928001. The reversal of 31977927968 is 86972977913.

It is a junction number, because it is equal to n+sod(n) for n = 31977927898 and 31977927907.

It is not an unprimeable number, because it can be changed into a prime (31977927967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71379080 + ... + 71379527.

It is an arithmetic number, because the mean of its divisors is an integer number (2997930768).

Almost surely, 2^31977927968 is an apocalyptic number.

It is an amenable number.

31977927968 is an abundant number, since it is smaller than the sum of its proper divisors (39972410464).

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

31977927968 is a wasteful number, since it uses less digits than its factorization.

31977927968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142758624 (or 142758616 counting only the distinct ones).

The product of its digits is 72013536, while the sum is 68.

The spelling of 31977927968 in words is "thirty-one billion, nine hundred seventy-seven million, nine hundred twenty-seven thousand, nine hundred sixty-eight".