813157806 has 32 divisors (see below), whose sum is σ = 1690432128. Its totient is φ = 260543520.

The previous prime is 813157777. The next prime is 813157819. The reversal of 813157806 is 608751318.

It is a super-2 number, since 2×813157806² = 1322451234917467272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3640 + ... + 40491.

It is an arithmetic number, because the mean of its divisors is an integer number (52826004).

Almost surely, 2^813157806 is an apocalyptic number.

813157806 is an abundant number, since it is smaller than the sum of its proper divisors (877274322).

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

813157806 is a wasteful number, since it uses less digits than its factorization.

813157806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44256.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 813157806 is about 28515.9219735221. The cubic root of 813157806 is about 933.3795436588.

The spelling of 813157806 in words is "eight hundred thirteen million, one hundred fifty-seven thousand, eight hundred six".