813305668 has 24 divisors (see below), whose sum is σ = 1697334912. Its totient is φ = 333404544.

The previous prime is 813305651. The next prime is 813305683. The reversal of 813305668 is 866503318.

It is a super-2 number, since 2×813305668² = 1322932219201852448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 813305668.

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 7 ways as a sum of consecutive naturals, for example, 630805 + ... + 632092.

It is an arithmetic number, because the mean of its divisors is an integer number (70722288).

Almost surely, 2^813305668 is an apocalyptic number.

It is an amenable number.

813305668 is an abundant number, since it is smaller than the sum of its proper divisors (884029244).

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

813305668 is a wasteful number, since it uses less digits than its factorization.

813305668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262931 (or 1262929 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 813305668 is about 28518.5144774408. The cubic root of 813305668 is about 933.4361144747.

The spelling of 813305668 in words is "eight hundred thirteen million, three hundred five thousand, six hundred sixty-eight".