31328213820 has 96 divisors (see below), whose sum is σ = 88185307392. Its totient is φ = 8309902848.

The previous prime is 31328213759. The next prime is 31328213831. The reversal of 31328213820 is 2831282313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10571659 + ... + 10574621.

It is an arithmetic number, because the mean of its divisors is an integer number (918596952).

Almost surely, 2^31328213820 is an apocalyptic number.

31328213820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31328213820 is an abundant number, since it is smaller than the sum of its proper divisors (56857093572).

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

31328213820 is a wasteful number, since it uses less digits than its factorization.

31328213820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851 (or 3849 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 31328213820 in words is "thirty-one billion, three hundred twenty-eight million, two hundred thirteen thousand, eight hundred twenty".