520808128804 has 24 divisors (see below), whose sum is σ = 929188464120. Its totient is φ = 255331824384.

The previous prime is 520808128787. The next prime is 520808128829. The reversal of 520808128804 is 408821808025.

It can be written as a sum of positive squares in 4 ways, for example, as 325125759204 + 195682369600 = 570198^2 + 442360^2 .

It is a super-2 number, since 2×520808128804² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422299 + ... + 1104514.

It is an arithmetic number, because the mean of its divisors is an integer number (38716186005).

Almost surely, 2^520808128804 is an apocalyptic number.

It is an amenable number.

520808128804 is a deficient number, since it is larger than the sum of its proper divisors (408380335316).

520808128804 is a wasteful number, since it uses less digits than its factorization.

520808128804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528479 (or 1528477 counting only the distinct ones).

The product of its (nonzero) digits is 327680, while the sum is 46.

The spelling of 520808128804 in words is "five hundred twenty billion, eight hundred eight million, one hundred twenty-eight thousand, eight hundred four".