31577045864 has 128 divisors (see below), whose sum is σ = 75960917760. Its totient is φ = 11972302848.

The previous prime is 31577045861. The next prime is 31577045911. The reversal of 31577045864 is 46854077513.

It is not an unprimeable number, because it can be changed into a prime (31577045861) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1795964 + ... + 1813460.

It is an arithmetic number, because the mean of its divisors is an integer number (593444670).

Almost surely, 2^31577045864 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 31577045864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37980458880).

31577045864 is an abundant number, since it is smaller than the sum of its proper divisors (44383871896).

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

31577045864 is a wasteful number, since it uses less digits than its factorization.

31577045864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17627 (or 17623 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 50.

The spelling of 31577045864 in words is "thirty-one billion, five hundred seventy-seven million, forty-five thousand, eight hundred sixty-four".