812120816 has 40 divisors (see below), whose sum is σ = 1722327264. Its totient is φ = 368674560.

The previous prime is 812120809. The next prime is 812120851. The reversal of 812120816 is 618021218.

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 7 ways as a sum of consecutive naturals, for example, 19316 + ... + 44691.

Almost surely, 2^812120816 is an apocalyptic number.

It is an amenable number.

812120816 is an abundant number, since it is smaller than the sum of its proper divisors (910206448).

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

812120816 is a wasteful number, since it uses less digits than its factorization.

812120816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64089 (or 64083 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 812120816 is about 28497.7335239138. The cubic root of 812120816 is about 932.9826067698.

The spelling of 812120816 in words is "eight hundred twelve million, one hundred twenty thousand, eight hundred sixteen".