28104204 has 24 divisors (see below), whose sum is σ = 66815280. Its totient is φ = 9191104.

The previous prime is 28104199. The next prime is 28104239. The reversal of 28104204 is 40240182.

28104204 = 15² + 16² + ... + 438².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21459 + ... + 22730.

It is an arithmetic number, because the mean of its divisors is an integer number (2783970).

Almost surely, 2^28104204 is an apocalyptic number.

It is an amenable number.

28104204 is an abundant number, since it is smaller than the sum of its proper divisors (38711076).

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

28104204 is a wasteful number, since it uses less digits than its factorization.

28104204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44249 (or 44247 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 28104204 is about 5301.3398306466. The cubic root of 28104204 is about 304.0351269428.

Adding to 28104204 its reverse (40240182), we get a palindrome (68344386).

The spelling of 28104204 in words is "twenty-eight million, one hundred four thousand, two hundred four".