520816840 has 32 divisors (see below), whose sum is σ = 1181076480. Its totient is φ = 206684352.

The previous prime is 520816837. The next prime is 520816843. The reversal of 520816840 is 48618025.

It is an interprime number because it is at equal distance from previous prime (520816837) and next prime (520816843).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 520816796 and 520816805.

It is not an unprimeable number, because it can be changed into a prime (520816843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46182 + ... + 56341.

It is an arithmetic number, because the mean of its divisors is an integer number (36908640).

Almost surely, 2^520816840 is an apocalyptic number.

It is an amenable number.

520816840 is an abundant number, since it is smaller than the sum of its proper divisors (660259640).

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

520816840 is a wasteful number, since it uses less digits than its factorization.

520816840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102661 (or 102657 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 520816840 is about 22821.4118756925. The cubic root of 520816840 is about 804.5659942080.

The spelling of 520816840 in words is "five hundred twenty million, eight hundred sixteen thousand, eight hundred forty".