813257600520 has 64 divisors (see below), whose sum is σ = 2441297283840. Its totient is φ = 216733184000.

The previous prime is 813257600501. The next prime is 813257600521. The reversal of 813257600520 is 25006752318.

It is a super-2 number, since 2×813257600520² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (813257600521) 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, 1924416 + ... + 2308655.

It is an arithmetic number, because the mean of its divisors is an integer number (38145270060).

Almost surely, 2^813257600520 is an apocalyptic number.

It is an amenable number.

813257600520 is an abundant number, since it is smaller than the sum of its proper divisors (1628039683320).

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

813257600520 is a wasteful number, since it uses less digits than its factorization.

813257600520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234686 (or 4234682 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 813257600520 in words is "eight hundred thirteen billion, two hundred fifty-seven million, six hundred thousand, five hundred twenty".