812709636 has 12 divisors (see below), whose sum is σ = 1896322512. Its totient is φ = 270903208.

The previous prime is 812709593. The next prime is 812709643. The reversal of 812709636 is 636907218.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between even and odd.

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 3 ways as a sum of consecutive naturals, for example, 33862890 + ... + 33862913.

It is an arithmetic number, because the mean of its divisors is an integer number (158026876).

Almost surely, 2^812709636 is an apocalyptic number.

It is an amenable number.

812709636 is an abundant number, since it is smaller than the sum of its proper divisors (1083612876).

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

812709636 is a wasteful number, since it uses less digits than its factorization.

812709636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67725810 (or 67725808 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 812709636 is about 28508.0626490121. The cubic root of 812709636 is about 933.2080355041.

The spelling of 812709636 in words is "eight hundred twelve million, seven hundred nine thousand, six hundred thirty-six".