31987664164 has 24 divisors (see below), whose sum is σ = 56226595320. Its totient is φ = 15923018496.

The previous prime is 31987664119. The next prime is 31987664179. The reversal of 31987664164 is 46146678913.

It can be written as a sum of positive squares in 4 ways, for example, as 12680561664 + 19307102500 = 112608^2 + 138950^2 .

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, 1417014 + ... + 1439410.

It is an arithmetic number, because the mean of its divisors is an integer number (2342774805).

Almost surely, 2^31987664164 is an apocalyptic number.

It is an amenable number.

31987664164 is a deficient number, since it is larger than the sum of its proper divisors (24238931156).

31987664164 is a wasteful number, since it uses less digits than its factorization.

31987664164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23967 (or 23965 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The spelling of 31987664164 in words is "thirty-one billion, nine hundred eighty-seven million, six hundred sixty-four thousand, one hundred sixty-four".