31857502056 has 32 divisors (see below), whose sum is σ = 79658609760. Its totient is φ = 10617186752.

The previous prime is 31857502051. The next prime is 31857502081. The reversal of 31857502056 is 65020575813.

It is a junction number, because it is equal to n+sod(n) for n = 31857501999 and 31857502017.

It is not an unprimeable number, because it can be changed into a prime (31857502051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10546 + ... + 252638.

It is an arithmetic number, because the mean of its divisors is an integer number (2489331555).

Almost surely, 2^31857502056 is an apocalyptic number.

It is an amenable number.

31857502056 is an abundant number, since it is smaller than the sum of its proper divisors (47801107704).

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

31857502056 is a wasteful number, since it uses less digits than its factorization.

31857502056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247585 (or 247581 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 42.

The spelling of 31857502056 in words is "thirty-one billion, eight hundred fifty-seven million, five hundred two thousand, fifty-six".