31564040 has 16 divisors (see below), whose sum is σ = 71019180. Its totient is φ = 12625600.

The previous prime is 31564009. The next prime is 31564051. The reversal of 31564040 is 4046513.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31561924 + 2116 = 5618^2 + 46^2 .

It is a super-2 number, since 2×31564040² = 1992577242243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31563997 and 31564015.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394511 + ... + 394590.

Almost surely, 2^31564040 is an apocalyptic number.

It is an amenable number.

31564040 is an abundant number, since it is smaller than the sum of its proper divisors (39455140).

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

31564040 is a wasteful number, since it uses less digits than its factorization.

31564040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789112 (or 789108 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 31564040 is about 5618.1883200904. The cubic root of 31564040 is about 316.0318559991.

The spelling of 31564040 in words is "thirty-one million, five hundred sixty-four thousand, forty".