809668 has 12 divisors (see below), whose sum is σ = 1451772. Its totient is φ = 394880.

The previous prime is 809629. The next prime is 809701. The reversal of 809668 is 866908.

It can be written as a sum of positive squares in 2 ways, for example, as 166464 + 643204 = 408^2 + 802^2 .

It is an Ulam 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, 2305 + ... + 2632.

It is an arithmetic number, because the mean of its divisors is an integer number (120981).

2⁸⁰⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

809668 is a deficient number, since it is larger than the sum of its proper divisors (642104).

809668 is a wasteful number, since it uses less digits than its factorization.

809668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4982 (or 4980 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 809668 is about 899.8155366518. The cubic root of 809668 is about 93.2042376210.

The spelling of 809668 in words is "eight hundred nine thousand, six hundred sixty-eight".