31289993008 has 80 divisors (see below), whose sum is σ = 65917700640. Its totient is φ = 14380713984.

The previous prime is 31289992999. The next prime is 31289993027. The reversal of 31289993008 is 80039998213.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3375516 + ... + 3384772.

It is an arithmetic number, because the mean of its divisors is an integer number (823971258).

Almost surely, 2^31289993008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31289993008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32958850320).

31289993008 is an abundant number, since it is smaller than the sum of its proper divisors (34627707632).

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

31289993008 is an equidigital number, since it uses as much as digits as its factorization.

31289993008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9359 (or 9319 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The spelling of 31289993008 in words is "thirty-one billion, two hundred eighty-nine million, nine hundred ninety-three thousand, eight".