812901220 has 24 divisors (see below), whose sum is σ = 1762161408. Its totient is φ = 314671200.

The previous prime is 812901203. The next prime is 812901239. The reversal of 812901220 is 22109218.

812901220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654946 + ... + 656185.

It is an arithmetic number, because the mean of its divisors is an integer number (73423392).

Almost surely, 2^812901220 is an apocalyptic number.

It is an amenable number.

812901220 is an abundant number, since it is smaller than the sum of its proper divisors (949260188).

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

812901220 is a wasteful number, since it uses less digits than its factorization.

812901220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311171 (or 1311169 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 812901220 is about 28511.4226232224. The cubic root of 812901220 is about 933.2813596342.

The spelling of 812901220 in words is "eight hundred twelve million, nine hundred one thousand, two hundred twenty".