31578608164 has 6 divisors (see below), whose sum is σ = 55262564294. Its totient is φ = 15789304080.

The previous prime is 31578608141. The next prime is 31578608177. The reversal of 31578608164 is 46180687513.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31555969600 + 22638564 = 177640^2 + 4758^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3947326017 + ... + 3947326024.

Almost surely, 2^31578608164 is an apocalyptic number.

It is an amenable number.

31578608164 is a deficient number, since it is larger than the sum of its proper divisors (23683956130).

31578608164 is a wasteful number, since it uses less digits than its factorization.

31578608164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894652045 (or 7894652043 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 31578608164 in words is "thirty-one billion, five hundred seventy-eight million, six hundred eight thousand, one hundred sixty-four".