28223204 has 12 divisors (see below), whose sum is σ = 49466928. Its totient is φ = 14089800.

The previous prime is 28223201. The next prime is 28223249. The reversal of 28223204 is 40232282.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28223204.

It is not an unprimeable number, because it can be changed into a prime (28223201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2342 + ... + 7869.

It is an arithmetic number, because the mean of its divisors is an integer number (4122244).

Almost surely, 2^28223204 is an apocalyptic number.

It is an amenable number.

28223204 is a deficient number, since it is larger than the sum of its proper divisors (21243724).

28223204 is a wasteful number, since it uses less digits than its factorization.

28223204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10906 (or 10904 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 28223204 is about 5312.5515526910. The cubic root of 28223204 is about 304.4636421296.

Adding to 28223204 its reverse (40232282), we get a palindrome (68455486).

The spelling of 28223204 in words is "twenty-eight million, two hundred twenty-three thousand, two hundred four".