520909864 has 32 divisors (see below), whose sum is σ = 1027261440. Its totient is φ = 247291200.

The previous prime is 520909859. The next prime is 520909913. The reversal of 520909864 is 468909025.

It is a self number, because there is not a number n which added to its sum of digits gives 520909864.

It is an unprimeable number.

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, 6672 + ... + 32959.

It is an arithmetic number, because the mean of its divisors is an integer number (32101920).

Almost surely, 2^520909864 is an apocalyptic number.

It is an amenable number.

520909864 is a deficient number, since it is larger than the sum of its proper divisors (506351576).

520909864 is a wasteful number, since it uses less digits than its factorization.

520909864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39721 (or 39717 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 520909864 is about 22823.4498706922. The cubic root of 520909864 is about 804.6138929993.

The spelling of 520909864 in words is "five hundred twenty million, nine hundred nine thousand, eight hundred sixty-four".