809644 has 12 divisors (see below), whose sum is σ = 1545768. Its totient is φ = 368000.

The previous prime is 809629. The next prime is 809701. The reversal of 809644 is 446908.

809644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 9157 + ... + 9244.

It is an arithmetic number, because the mean of its divisors is an integer number (128814).

2⁸⁰⁹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

809644 is a deficient number, since it is larger than the sum of its proper divisors (736124).

809644 is a wasteful number, since it uses less digits than its factorization.

809644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18416 (or 18414 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 809644 is about 899.8022004863. The cubic root of 809644 is about 93.2033166988.

The spelling of 809644 in words is "eight hundred nine thousand, six hundred forty-four".