520521568 has 144 divisors (see below), whose sum is σ = 1274271264. Its totient is φ = 204871680.

The previous prime is 520521559. The next prime is 520521571. The reversal of 520521568 is 865125025.

520521568 is nontrivially palindromic in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3315346 + ... + 3315502.

It is an arithmetic number, because the mean of its divisors is an integer number (8849106).

Almost surely, 2^520521568 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 520521568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637135632).

520521568 is an abundant number, since it is smaller than the sum of its proper divisors (753749696).

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

520521568 is a wasteful number, since it uses less digits than its factorization.

520521568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 520521568 is about 22814.9417706905. The cubic root of 520521568 is about 804.4139185316.

The spelling of 520521568 in words is "five hundred twenty million, five hundred twenty-one thousand, five hundred sixty-eight".