31576720172 has 6 divisors (see below), whose sum is σ = 55259260308. Its totient is φ = 15788360084.

The previous prime is 31576720129. The next prime is 31576720199. The reversal of 31576720172 is 27102767513.

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, 3947090018 + ... + 3947090025.

It is an arithmetic number, because the mean of its divisors is an integer number (9209876718).

Almost surely, 2^31576720172 is an apocalyptic number.

It is an amenable number.

31576720172 is a deficient number, since it is larger than the sum of its proper divisors (23682540136).

31576720172 is a wasteful number, since it uses less digits than its factorization.

31576720172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7894180047 (or 7894180045 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 41.

The spelling of 31576720172 in words is "thirty-one billion, five hundred seventy-six million, seven hundred twenty thousand, one hundred seventy-two".