812820812 has 24 divisors (see below), whose sum is σ = 1441670160. Its totient is φ = 400942080.

The previous prime is 812820761. The next prime is 812820857. The reversal of 812820812 is 218028218.

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, 125264 + ... + 131592.

It is an arithmetic number, because the mean of its divisors is an integer number (60069590).

Almost surely, 2^812820812 is an apocalyptic number.

It is an amenable number.

812820812 is a deficient number, since it is larger than the sum of its proper divisors (628849348).

812820812 is a wasteful number, since it uses less digits than its factorization.

812820812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6761 (or 6759 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 812820812 is about 28510.0124868440. The cubic root of 812820812 is about 933.2505868252.

The spelling of 812820812 in words is "eight hundred twelve million, eight hundred twenty thousand, eight hundred twelve".