520720816 has 80 divisors (see below), whose sum is σ = 1275775488. Its totient is φ = 199987200.

The previous prime is 520720799. The next prime is 520720847. The reversal of 520720816 is 618027025.

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 15 ways as a sum of consecutive naturals, for example, 84496 + ... + 90448.

Almost surely, 2^520720816 is an apocalyptic number.

520720816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 520720816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (637887744).

520720816 is an abundant number, since it is smaller than the sum of its proper divisors (755054672).

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

520720816 is a wasteful number, since it uses less digits than its factorization.

520720816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050 (or 6044 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 520720816 is about 22819.3079649669. The cubic root of 520720816 is about 804.5165447102.

The spelling of 520720816 in words is "five hundred twenty million, seven hundred twenty thousand, eight hundred sixteen".