31579578972 has 96 divisors (see below), whose sum is σ = 83086203200. Its totient is φ = 10371628800.

The previous prime is 31579578941. The next prime is 31579578977. The reversal of 31579578972 is 27987597513.

31579578972 is a `hidden beast` number, since 3 + 1 + 57 + 9 + 578 + 9 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31579578977) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2123322 + ... + 2138142.

Almost surely, 2^31579578972 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 31579578972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41543101600).

31579578972 is an abundant number, since it is smaller than the sum of its proper divisors (51506624228).

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

31579578972 is a wasteful number, since it uses less digits than its factorization.

31579578972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15124 (or 15116 counting only the distinct ones).

The product of its digits is 33339600, while the sum is 63.

The spelling of 31579578972 in words is "thirty-one billion, five hundred seventy-nine million, five hundred seventy-eight thousand, nine hundred seventy-two".