520664 has 16 divisors (see below), whose sum is σ = 1003200. Its totient is φ = 253152.

The previous prime is 520649. The next prime is 520679. The reversal of 520664 is 466025.

It is an interprime number because it is at equal distance from previous prime (520649) and next prime (520679).

It is a congruent number.

It is an unprimeable number.

520664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 584 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (62700).

2⁵²⁰⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

520664 is a deficient number, since it is larger than the sum of its proper divisors (482536).

520664 is a wasteful number, since it uses less digits than its factorization.

520664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802 (or 1798 counting only the distinct ones).

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

The square root of 520664 is about 721.5705093752. The cubic root of 520664 is about 80.4487283301.

Adding to 520664 its reverse (466025), we get a palindrome (986689).

The spelling of 520664 in words is "five hundred twenty thousand, six hundred sixty-four".