28804 has 12 divisors (see below), whose sum is σ = 53200. Its totient is φ = 13608.

The previous prime is 28793. The next prime is 28807. The reversal of 28804 is 40882.

28804 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is not an unprimeable number, because it can be changed into a prime (28807) by changing a digit.

28804 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 (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114 + ... + 265.

2²⁸⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

28804 is a deficient number, since it is larger than the sum of its proper divisors (24396).

28804 is a wasteful number, since it uses less digits than its factorization.

28804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 28804 is about 169.7174121886. The cubic root of 28804 is about 30.6537963216.

Subtracting from 28804 its sum of digits (22), we obtain a palindrome (28782).

The spelling of 28804 in words is "twenty-eight thousand, eight hundred four".