31604560 has 40 divisors (see below), whose sum is σ = 79135560. Its totient is φ = 11668992.

The previous prime is 31604557. The next prime is 31604561. The reversal of 31604560 is 6540613.

It can be written as a sum of positive squares in 4 ways, for example, as 1617984 + 29986576 = 1272^2 + 5476^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31604561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14155 + ... + 16234.

It is an arithmetic number, because the mean of its divisors is an integer number (1978389).

Almost surely, 2^31604560 is an apocalyptic number.

It is an amenable number.

31604560 is an abundant number, since it is smaller than the sum of its proper divisors (47531000).

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

31604560 is a wasteful number, since it uses less digits than its factorization.

31604560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30415 (or 30409 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 31604560 is about 5621.7933081891. The cubic root of 31604560 is about 316.1670323477.

The spelling of 31604560 in words is "thirty-one million, six hundred four thousand, five hundred sixty".