31837840864 has 48 divisors (see below), whose sum is σ = 64274557536. Its totient is φ = 15514931200.

The previous prime is 31837840841. The next prime is 31837840871. The reversal of 31837840864 is 46804873813.

It is a super-2 number, since 2×31837840864² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1340904 + ... + 1364440.

It is an arithmetic number, because the mean of its divisors is an integer number (1339053282).

Almost surely, 2^31837840864 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 31837840864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32137278768).

31837840864 is an abundant number, since it is smaller than the sum of its proper divisors (32436716672).

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

31837840864 is a wasteful number, since it uses less digits than its factorization.

31837840864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24619 (or 24611 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 31837840864 in words is "thirty-one billion, eight hundred thirty-seven million, eight hundred forty thousand, eight hundred sixty-four".