31563923864 has 16 divisors (see below), whose sum is σ = 64562571720. Its totient is φ = 14347238080.

The previous prime is 31563923861. The next prime is 31563923873. The reversal of 31563923864 is 46832936513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31563923861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179340389 + ... + 179340564.

Almost surely, 2^31563923864 is an apocalyptic number.

It is an amenable number.

31563923864 is an abundant number, since it is smaller than the sum of its proper divisors (32998647856).

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

31563923864 is a wasteful number, since it uses less digits than its factorization.

31563923864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358680970 (or 358680966 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 50.

The spelling of 31563923864 in words is "thirty-one billion, five hundred sixty-three million, nine hundred twenty-three thousand, eight hundred sixty-four".