520078809 has 16 divisors (see below), whose sum is σ = 712825344. Its totient is φ = 337084800.

The previous prime is 520078799. The next prime is 520078813. The reversal of 520078809 is 908870025.

It is not a de Polignac number, because 520078809 - 2⁷ = 520078681 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520078859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28824 + ... + 43254.

It is an arithmetic number, because the mean of its divisors is an integer number (44551584).

Almost surely, 2^520078809 is an apocalyptic number.

It is an amenable number.

520078809 is a deficient number, since it is larger than the sum of its proper divisors (192746535).

520078809 is a wasteful number, since it uses less digits than its factorization.

520078809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14768.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 520078809 is about 22805.2364381517. The cubic root of 520078809 is about 804.1857739447.

The spelling of 520078809 in words is "five hundred twenty million, seventy-eight thousand, eight hundred nine".