31989564140 has 24 divisors (see below), whose sum is σ = 67191293232. Its totient is φ = 12793309760.

The previous prime is 31989564121. The next prime is 31989564161. The reversal of 31989564140 is 4146598913.

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, 51239 + ... + 258078.

It is an arithmetic number, because the mean of its divisors is an integer number (2799637218).

Almost surely, 2^31989564140 is an apocalyptic number.

It is an amenable number.

31989564140 is an abundant number, since it is smaller than the sum of its proper divisors (35201729092).

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

31989564140 is a wasteful number, since it uses less digits than its factorization.

31989564140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314497 (or 314495 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 31989564140 in words is "thirty-one billion, nine hundred eighty-nine million, five hundred sixty-four thousand, one hundred forty".