31640004612 has 18 divisors (see below), whose sum is σ = 79978900638. Its totient is φ = 10546668192.

The previous prime is 31640004587. The next prime is 31640004637. The reversal of 31640004612 is 21640004613.

31640004612 is a `hidden beast` number, since 3 + 1 + 6 + 40 + 0 + 0 + 4 + 612 = 666.

It is an interprime number because it is at equal distance from previous prime (31640004587) and next prime (31640004637).

It can be written as a sum of positive squares in only one way, i.e., 30518692416 + 1121312196 = 174696^2 + 33486^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 439444473 + ... + 439444544.

Almost surely, 2^31640004612 is an apocalyptic number.

It is an amenable number.

31640004612 is an abundant number, since it is smaller than the sum of its proper divisors (48338896026).

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

31640004612 is a wasteful number, since it uses less digits than its factorization.

31640004612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878889027 (or 878889022 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Subtracting from 31640004612 its reverse (21640004613), we obtain a palindrome (9999999999).

The spelling of 31640004612 in words is "thirty-one billion, six hundred forty million, four thousand, six hundred twelve".