812665964 has 24 divisors (see below), whose sum is σ = 1557964800. Its totient is φ = 367843280.

The previous prime is 812665951. The next prime is 812665979. The reversal of 812665964 is 469566218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28124 + ... + 49155.

It is an arithmetic number, because the mean of its divisors is an integer number (64915200).

Almost surely, 2^812665964 is an apocalyptic number.

It is an amenable number.

812665964 is a deficient number, since it is larger than the sum of its proper divisors (745298836).

812665964 is a wasteful number, since it uses less digits than its factorization.

812665964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77533 (or 77531 counting only the distinct ones).

The product of its digits is 622080, while the sum is 47.

The square root of 812665964 is about 28507.2966799730. The cubic root of 812665964 is about 933.1913194924.

The spelling of 812665964 in words is "eight hundred twelve million, six hundred sixty-five thousand, nine hundred sixty-four".