809085872 has 20 divisors (see below), whose sum is σ = 1791547536. Its totient is φ = 346751040.

The previous prime is 809085859. The next prime is 809085889. The reversal of 809085872 is 278580908.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

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, 3611879 + ... + 3612102.

Almost surely, 2^809085872 is an apocalyptic number.

It is an amenable number.

809085872 is an abundant number, since it is smaller than the sum of its proper divisors (982461664).

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

809085872 is a wasteful number, since it uses less digits than its factorization.

809085872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223996 (or 7223990 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 809085872 is about 28444.4348159706. The cubic root of 809085872 is about 931.8189521042.

The spelling of 809085872 in words is "eight hundred nine million, eighty-five thousand, eight hundred seventy-two".