31820681256 has 64 divisors (see below), whose sum is σ = 97909795200. Its totient is φ = 8392267008.

The previous prime is 31820681203. The next prime is 31820681287. The reversal of 31820681256 is 65218602813.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7282771 + ... + 7287138.

It is an arithmetic number, because the mean of its divisors is an integer number (1529840550).

Almost surely, 2^31820681256 is an apocalyptic number.

It is an amenable number.

31820681256 is an abundant number, since it is smaller than the sum of its proper divisors (66089113944).

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

31820681256 is a wasteful number, since it uses less digits than its factorization.

31820681256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14569938 (or 14569934 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The spelling of 31820681256 in words is "thirty-one billion, eight hundred twenty million, six hundred eighty-one thousand, two hundred fifty-six".