816804 has 30 divisors (see below), whose sum is σ = 2136134. Its totient is φ = 272160.

The previous prime is 816779. The next prime is 816811. The reversal of 816804 is 408618.

816804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 419904 + 396900 = 648^2 + 630^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

816804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 937 + ... + 1584.

2⁸¹⁶⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

816804 is an abundant number, since it is smaller than the sum of its proper divisors (1319330).

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

816804 is a wasteful number, since it uses less digits than its factorization.

816804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 816804 is about 903.7720951656. The cubic root of 816804 is about 93.4772552795.

The spelling of 816804 in words is "eight hundred sixteen thousand, eight hundred four".