813873868 has 12 divisors (see below), whose sum is σ = 1428831880. Its totient is φ = 405636192.

The previous prime is 813873763. The next prime is 813873871. The reversal of 813873868 is 868378318.

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 3 ways as a sum of consecutive naturals, for example, 323778 + ... + 326281.

Almost surely, 2^813873868 is an apocalyptic number.

It is an amenable number.

813873868 is a deficient number, since it is larger than the sum of its proper divisors (614958012).

813873868 is a wasteful number, since it uses less digits than its factorization.

813873868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650376 (or 650374 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 52.

The square root of 813873868 is about 28528.4746875819. The cubic root of 813873868 is about 933.6534394634.

The spelling of 813873868 in words is "eight hundred thirteen million, eight hundred seventy-three thousand, eight hundred sixty-eight".