31631657960 has 48 divisors (see below), whose sum is σ = 82791028260. Its totient is φ = 10845139200.

The previous prime is 31631657933. The next prime is 31631657963. The reversal of 31631657960 is 6975613613.

It can be written as a sum of positive squares in 2 ways, for example, as 28758054724 + 2873603236 = 169582^2 + 53606^2 .

It is not an unprimeable number, because it can be changed into a prime (31631657963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8067341 + ... + 8071260.

Almost surely, 2^31631657960 is an apocalyptic number.

It is an amenable number.

31631657960 is an abundant number, since it is smaller than the sum of its proper divisors (51159370300).

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

31631657960 is a wasteful number, since it uses less digits than its factorization.

31631657960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16138626 (or 16138615 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 47.

The spelling of 31631657960 in words is "thirty-one billion, six hundred thirty-one million, six hundred fifty-seven thousand, nine hundred sixty".