809642688 has 56 divisors (see below), whose sum is σ = 2235330048. Its totient is φ = 258145536.

The previous prime is 809642651. The next prime is 809642741. The reversal of 809642688 is 886246908.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 809642688.

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, 87256 + ... + 96087.

It is an arithmetic number, because the mean of its divisors is an integer number (39916608).

Almost surely, 2^809642688 is an apocalyptic number.

It is an amenable number.

809642688 is an abundant number, since it is smaller than the sum of its proper divisors (1425687360).

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

809642688 is a wasteful number, since it uses less digits than its factorization.

809642688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183381 (or 183371 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The square root of 809642688 is about 28454.2209171153. The cubic root of 809642688 is about 932.0326635448.

The spelling of 809642688 in words is "eight hundred nine million, six hundred forty-two thousand, six hundred eighty-eight".