31064640 has 56 divisors (see below), whose sum is σ = 98633280. Its totient is φ = 8283648.

The previous prime is 31064623. The next prime is 31064641. The reversal of 31064640 is 4646013.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31064640.

It is not an unprimeable number, because it can be changed into a prime (31064641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15220 + ... + 17139.

Almost surely, 2^31064640 is an apocalyptic number.

31064640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31064640 is an abundant number, since it is smaller than the sum of its proper divisors (67568640).

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

31064640 is a wasteful number, since it uses less digits than its factorization.

31064640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32379 (or 32369 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 31064640 is about 5573.5661833336. The cubic root of 31064640 is about 314.3562564992.

The spelling of 31064640 in words is "thirty-one million, sixty-four thousand, six hundred forty".