812851164 has 36 divisors (see below), whose sum is σ = 2056594176. Its totient is φ = 270701568.

The previous prime is 812851157. The next prime is 812851219. The reversal of 812851164 is 461158218.

812851164 is a `hidden beast` number, since 81 + 2 + 8 + 511 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31717 + ... + 51299.

It is an arithmetic number, because the mean of its divisors is an integer number (57127616).

Almost surely, 2^812851164 is an apocalyptic number.

It is an amenable number.

812851164 is an abundant number, since it is smaller than the sum of its proper divisors (1243743012).

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

812851164 is a wasteful number, since it uses less digits than its factorization.

812851164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20746 (or 20741 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 812851164 is about 28510.5447860962. The cubic root of 812851164 is about 933.2622030259.

The spelling of 812851164 in words is "eight hundred twelve million, eight hundred fifty-one thousand, one hundred sixty-four".