520660 has 24 divisors (see below), whose sum is σ = 1249920. Its totient is φ = 178464.

The previous prime is 520649. The next prime is 520679. The reversal of 520660 is 66025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1720 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (52080).

2⁵²⁰⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

520660 is an abundant number, since it is smaller than the sum of its proper divisors (729260).

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

520660 is a wasteful number, since it uses less digits than its factorization.

520660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3735 (or 3733 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 520660 is about 721.5677376380. The cubic root of 520660 is about 80.4485223138.

Adding to 520660 its reverse (66025), we get a palindrome (586685).

The spelling of 520660 in words is "five hundred twenty thousand, six hundred sixty".