805721812 has 12 divisors (see below), whose sum is σ = 1611443680. Its totient is φ = 345309336.

The previous prime is 805721801. The next prime is 805721843. The reversal of 805721812 is 218127508.

805721812 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14387862 + ... + 14387917.

Almost surely, 2^805721812 is an apocalyptic number.

It is an amenable number.

805721812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

805721812 is a wasteful number, since it uses less digits than its factorization.

805721812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28775790 (or 28775788 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 805721812 is about 28385.2393331464. The cubic root of 805721812 is about 930.5257027021.

The spelling of 805721812 in words is "eight hundred five million, seven hundred twenty-one thousand, eight hundred twelve".