31897214475880 has 32 divisors (see below), whose sum is σ = 77289404308200. Its totient is φ = 11777433037056.

The previous prime is 31897214475877. The next prime is 31897214475913. The reversal of 31897214475880 is 8857441279813.

It can be written as a sum of positive squares in 4 ways, for example, as 19750860309636 + 12146354166244 = 4444194^2 + 3485162^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors.

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, 30670398015 + ... + 30670399054.

Almost surely, 2^{31897214475880} is an apocalyptic number.

It is an amenable number.

31897214475880 is an abundant number, since it is smaller than the sum of its proper divisors (45392189832320).

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

31897214475880 is a wasteful number, since it uses less digits than its factorization.

31897214475880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61340797093 (or 61340797089 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 67.

The spelling of 31897214475880 in words is "thirty-one trillion, eight hundred ninety-seven billion, two hundred fourteen million, four hundred seventy-five thousand, eight hundred eighty".