31977864 has 48 divisors (see below), whose sum is σ = 89406720. Its totient is φ = 10314720.

The previous prime is 31977863. The next prime is 31977871. The reversal of 31977864 is 46877913.

It is not an unprimeable number, because it can be changed into a prime (31977863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4932 + ... + 9395.

It is an arithmetic number, because the mean of its divisors is an integer number (1862640).

Almost surely, 2^31977864 is an apocalyptic number.

It is an amenable number.

31977864 is an abundant number, since it is smaller than the sum of its proper divisors (57428856).

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

31977864 is a wasteful number, since it uses less digits than its factorization.

31977864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14370 (or 14363 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 31977864 is about 5654.8973465484. The cubic root of 31977864 is about 317.4069878620.

The spelling of 31977864 in words is "thirty-one million, nine hundred seventy-seven thousand, eight hundred sixty-four".