31138732568 has 16 divisors (see below), whose sum is σ = 59486730480. Its totient is φ = 15275604448.

The previous prime is 31138732549. The next prime is 31138732577. The reversal of 31138732568 is 86523783113.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36719780 + ... + 36720627.

It is an arithmetic number, because the mean of its divisors is an integer number (3717920655).

Almost surely, 2^31138732568 is an apocalyptic number.

It is an amenable number.

31138732568 is a deficient number, since it is larger than the sum of its proper divisors (28347997912).

31138732568 is a wasteful number, since it uses less digits than its factorization.

31138732568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73440466 (or 73440462 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The spelling of 31138732568 in words is "thirty-one billion, one hundred thirty-eight million, seven hundred thirty-two thousand, five hundred sixty-eight".