520265664 has 84 divisors (see below), whose sum is σ = 1499372160. Its totient is φ = 172477440.

The previous prime is 520265659. The next prime is 520265693. The reversal of 520265664 is 466562025.

520265664 is a `hidden beast` number, since 520 + 26 + 56 + 64 = 666.

It is a super-2 number, since 2×520265664² = 541352722274721792, 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, 107652 + ... + 112380.

Almost surely, 2^520265664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520265664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749686080).

520265664 is an abundant number, since it is smaller than the sum of its proper divisors (979106496).

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

520265664 is a wasteful number, since it uses less digits than its factorization.

520265664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938 (or 4925 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 520265664 is about 22809.3328267181. The cubic root of 520265664 is about 804.2820722607.

The spelling of 520265664 in words is "five hundred twenty million, two hundred sixty-five thousand, six hundred sixty-four".