520663860 has 36 divisors (see below), whose sum is σ = 1579347588. Its totient is φ = 138843648.

The previous prime is 520663763. The next prime is 520663921. The reversal of 520663860 is 68366025.

It can be written as a sum of positive squares in 2 ways, for example, as 148791204 + 371872656 = 12198^2 + 19284^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×520663860² = 542181710220199200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1446109 + ... + 1446468.

Almost surely, 2^520663860 is an apocalyptic number.

It is an amenable number.

520663860 is an abundant number, since it is smaller than the sum of its proper divisors (1058683728).

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

520663860 is a wasteful number, since it uses less digits than its factorization.

520663860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892592 (or 2892587 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 520663860 is about 22818.0599525902. The cubic root of 520663860 is about 804.4872111955.

The spelling of 520663860 in words is "five hundred twenty million, six hundred sixty-three thousand, eight hundred sixty".