520686025 has 12 divisors (see below), whose sum is σ = 646390672. Its totient is φ = 416071440.

The previous prime is 520685989. The next prime is 520686031.

520686025 = 258² + 259² + ... + 1164².

520686025 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 520686025 - 2⁷ = 520685897 is a prime.

It is a super-2 number, since 2×520686025² = 542227873260601250, which contains 22 as substring.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 11194 + ... + 34156.

Almost surely, 2^520686025 is an apocalyptic number.

It is an amenable number.

520686025 is a deficient number, since it is larger than the sum of its proper divisors (125704647).

520686025 is a wasteful number, since it uses less digits than its factorization.

520686025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23880 (or 23875 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 520686025 is about 22818.5456372662. The cubic root of 520686025 is about 804.4986268819.

The spelling of 520686025 in words is "five hundred twenty million, six hundred eighty-six thousand, twenty-five".