520345504 has 72 divisors (see below), whose sum is σ = 1224028260. Its totient is φ = 216953856.

The previous prime is 520345487. The next prime is 520345519. The reversal of 520345504 is 405543025.

It can be written as a sum of positive squares in 2 ways, for example, as 490533904 + 29811600 = 22148^2 + 5460^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 53532 + ... + 62500.

Almost surely, 2^520345504 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 520345504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (612014130).

520345504 is an abundant number, since it is smaller than the sum of its proper divisors (703682756).

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

520345504 is a wasteful number, since it uses less digits than its factorization.

520345504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030 (or 9015 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 520345504 is about 22811.0829203701. The cubic root of 520345504 is about 804.3232118813.

Adding to 520345504 its reverse (405543025), we get a palindrome (925888529).

The spelling of 520345504 in words is "five hundred twenty million, three hundred forty-five thousand, five hundred four".