813888881252 has 24 divisors (see below), whose sum is σ = 1501823195040. Its totient is φ = 384869517120.

The previous prime is 813888881249. The next prime is 813888881279. The reversal of 813888881252 is 252188888318.

It is a super-2 number, since 2×813888881252² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9077249 + ... + 9166472.

It is an arithmetic number, because the mean of its divisors is an integer number (62575966460).

Almost surely, 2^813888881252 is an apocalyptic number.

It is an amenable number.

813888881252 is a deficient number, since it is larger than the sum of its proper divisors (687934313788).

813888881252 is a wasteful number, since it uses less digits than its factorization.

813888881252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18244331 (or 18244329 counting only the distinct ones).

The product of its digits is 15728640, while the sum is 62.

The spelling of 813888881252 in words is "eight hundred thirteen billion, eight hundred eighty-eight million, eight hundred eighty-one thousand, two hundred fifty-two".