31431372864 has 56 divisors (see below), whose sum is σ = 83797066848. Its totient is φ = 10397137920.

The previous prime is 31431372853. The next prime is 31431372883. The reversal of 31431372864 is 46827313413.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599677 + ... + 649980.

Almost surely, 2^31431372864 is an apocalyptic number.

It is an amenable number.

31431372864 is an abundant number, since it is smaller than the sum of its proper divisors (52365693984).

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

31431372864 is a wasteful number, since it uses less digits than its factorization.

31431372864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249803 (or 1249793 counting only the distinct ones).

The product of its digits is 290304, while the sum is 42.

The spelling of 31431372864 in words is "thirty-one billion, four hundred thirty-one million, three hundred seventy-two thousand, eight hundred sixty-four".