31522732864 has 56 divisors (see below), whose sum is σ = 71743750848. Its totient is φ = 13461611520.

The previous prime is 31522732849. The next prime is 31522732877. The reversal of 31522732864 is 46823722513.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-4 number, since 4×31522732864⁴ (a number of 43 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31522732864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687 + ... + 251089.

It is an arithmetic number, because the mean of its divisors is an integer number (1281138408).

Almost surely, 2^31522732864 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 31522732864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35871875424).

31522732864 is an abundant number, since it is smaller than the sum of its proper divisors (40221017984).

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

31522732864 is a wasteful number, since it uses less digits than its factorization.

31522732864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250703 (or 250693 counting only the distinct ones).

The product of its digits is 483840, while the sum is 43.

The spelling of 31522732864 in words is "thirty-one billion, five hundred twenty-two million, seven hundred thirty-two thousand, eight hundred sixty-four".