812205104 has 20 divisors (see below), whose sum is σ = 1574271264. Its totient is φ = 405941568.

The previous prime is 812205091. The next prime is 812205133. The reversal of 812205104 is 401502218.

It is a self number, because there is not a number n which added to its sum of digits gives 812205104.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38729 + ... + 55895.

Almost surely, 2^812205104 is an apocalyptic number.

It is an amenable number.

812205104 is a deficient number, since it is larger than the sum of its proper divisors (762066160).

812205104 is a wasteful number, since it uses less digits than its factorization.

812205104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20132 (or 20126 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 812205104 is about 28499.2123399928. The cubic root of 812205104 is about 933.0148829681.

The spelling of 812205104 in words is "eight hundred twelve million, two hundred five thousand, one hundred four".