31854647864 has 32 divisors (see below), whose sum is σ = 64351415520. Its totient is φ = 14695395456.

The previous prime is 31854647831. The next prime is 31854647879. The reversal of 31854647864 is 46874645813.

It is a congruent number.

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, 160949 + ... + 299355.

It is an arithmetic number, because the mean of its divisors is an integer number (2010981735).

Almost surely, 2^31854647864 is an apocalyptic number.

It is an amenable number.

31854647864 is an abundant number, since it is smaller than the sum of its proper divisors (32496767656).

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

31854647864 is a wasteful number, since it uses less digits than its factorization.

31854647864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140639 (or 140635 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 56.

The spelling of 31854647864 in words is "thirty-one billion, eight hundred fifty-four million, six hundred forty-seven thousand, eight hundred sixty-four".