520489660 has 24 divisors (see below), whose sum is σ = 1093823136. Its totient is φ = 208044480.

The previous prime is 520489649. The next prime is 520489679. The reversal of 520489660 is 66984025.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

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, 21145 + ... + 38575.

It is an arithmetic number, because the mean of its divisors is an integer number (45575964).

Almost surely, 2^520489660 is an apocalyptic number.

It is an amenable number.

520489660 is an abundant number, since it is smaller than the sum of its proper divisors (573333476).

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

520489660 is a wasteful number, since it uses less digits than its factorization.

520489660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18933 (or 18931 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 520489660 is about 22814.2424813974. The cubic root of 520489660 is about 804.3974813237.

It can be divided in two parts, 5204 and 89660, that added together give a square (94864 = 308²).

The spelling of 520489660 in words is "five hundred twenty million, four hundred eighty-nine thousand, six hundred sixty".