810804 has 12 divisors (see below), whose sum is σ = 1891904. Its totient is φ = 270264.

The previous prime is 810791. The next prime is 810809. The reversal of 810804 is 408018.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 810804.

It is not an unprimeable number, because it can be changed into a prime (810809) by changing a digit.

810804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33772 + ... + 33795.

2⁸¹⁰⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

810804 is an abundant number, since it is smaller than the sum of its proper divisors (1081100).

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

810804 is a wasteful number, since it uses less digits than its factorization.

810804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67574 (or 67572 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 810804 is about 900.4465558821. The cubic root of 810804 is about 93.2478071394.

The spelling of 810804 in words is "eight hundred ten thousand, eight hundred four".