812089720 has 32 divisors (see below), whose sum is σ = 1967757120. Its totient is φ = 299848320.

The previous prime is 812089717. The next prime is 812089739. The reversal of 812089720 is 27980218.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 812089720.

It is a congruent number.

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, 780336 + ... + 781375.

It is an arithmetic number, because the mean of its divisors is an integer number (61492410).

Almost surely, 2^812089720 is an apocalyptic number.

It is an amenable number.

812089720 is an abundant number, since it is smaller than the sum of its proper divisors (1155667400).

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

812089720 is a wasteful number, since it uses less digits than its factorization.

812089720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561735 (or 1561731 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 812089720 is about 28497.1879314433. The cubic root of 812089720 is about 932.9706986904.

The spelling of 812089720 in words is "eight hundred twelve million, eighty-nine thousand, seven hundred twenty".