520431564 has 72 divisors (see below), whose sum is σ = 1285406640. Its totient is φ = 163689344.

The previous prime is 520431563. The next prime is 520431577. The reversal of 520431564 is 465134025.

It is not an unprimeable number, because it can be changed into a prime (520431563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 768394 + ... + 769070.

It is an arithmetic number, because the mean of its divisors is an integer number (17852870).

Almost surely, 2^520431564 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 520431564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642703320).

520431564 is an abundant number, since it is smaller than the sum of its proper divisors (764975076).

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

520431564 is a wasteful number, since it uses less digits than its factorization.

520431564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 520431564 is about 22812.9692061336. The cubic root of 520431564 is about 804.3675518050.

Adding to 520431564 its reverse (465134025), we get a palindrome (985565589).

The spelling of 520431564 in words is "five hundred twenty million, four hundred thirty-one thousand, five hundred sixty-four".