31904389924 has 81 divisors (see below), whose sum is σ = 64336325809. Its totient is φ = 13832177920.

The previous prime is 31904389921. The next prime is 31904389927. The reversal of 31904389924 is 42998340913.

It is a happy number.

The square root of 31904389924 is 178618.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (31904389921) and next prime (31904389927).

It can be written as a sum of positive squares in only one way, i.e., 12961822500 + 18942567424 = 113850^2 + 137632^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31904389921) 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 26 ways as a sum of consecutive naturals, for example, 90380532 + ... + 90380884.

Almost surely, 2^31904389924 is an apocalyptic number.

31904389924 is the 178618-th square number.

It is an amenable number.

31904389924 is an abundant number, since it is smaller than the sum of its proper divisors (32431935885).

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

31904389924 is a wasteful number, since it uses less digits than its factorization.

31904389924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The spelling of 31904389924 in words is "thirty-one billion, nine hundred four million, three hundred eighty-nine thousand, nine hundred twenty-four".