520645504 has 16 divisors (see below), whose sum is σ = 1037223720. Its totient is φ = 260322688.

The previous prime is 520645493. The next prime is 520645507. The reversal of 520645504 is 405546025.

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520645507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2033644 + ... + 2033899.

Almost surely, 2^520645504 is an apocalyptic number.

It is an amenable number.

520645504 is a deficient number, since it is larger than the sum of its proper divisors (516578216).

520645504 is an equidigital number, since it uses as much as digits as its factorization.

520645504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067557 (or 4067545 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 520645504 is about 22817.6577237893. The cubic root of 520645504 is about 804.4777570211.

The spelling of 520645504 in words is "five hundred twenty million, six hundred forty-five thousand, five hundred four".