520730404 has 12 divisors (see below), whose sum is σ = 926217628. Its totient is φ = 256096800.

The previous prime is 520730393. The next prime is 520730407. The reversal of 520730404 is 404037025.

It can be written as a sum of positive squares in 2 ways, for example, as 116640000 + 404090404 = 10800^2 + 20102^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (520730407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066827 + ... + 1067314.

Almost surely, 2^520730404 is an apocalyptic number.

It is an amenable number.

520730404 is a deficient number, since it is larger than the sum of its proper divisors (405487224).

520730404 is a wasteful number, since it uses less digits than its factorization.

520730404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134206 (or 2134204 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 520730404 is about 22819.5180492490. The cubic root of 520730404 is about 804.5214825176.

Adding to 520730404 its reverse (404037025), we get a palindrome (924767429).

The spelling of 520730404 in words is "five hundred twenty million, seven hundred thirty thousand, four hundred four".