809686872 has 24 divisors (see below), whose sum is σ = 2192902140. Its totient is φ = 269895600.

The previous prime is 809686847. The next prime is 809686877. The reversal of 809686872 is 278686908.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809686877) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5622754 + ... + 5622897.

Almost surely, 2^809686872 is an apocalyptic number.

It is an amenable number.

809686872 is an abundant number, since it is smaller than the sum of its proper divisors (1383215268).

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

809686872 is a wasteful number, since it uses less digits than its factorization.

809686872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11245663 (or 11245656 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 809686872 is about 28454.9973115444. The cubic root of 809686872 is about 932.0496176007.

The spelling of 809686872 in words is "eight hundred nine million, six hundred eighty-six thousand, eight hundred seventy-two".