28804223 has 4 divisors (see below), whose sum is σ = 32919120. Its totient is φ = 24689328.

The previous prime is 28804207. The next prime is 28804229. The reversal of 28804223 is 32240882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28804223 - 2⁴ = 28804207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28804229) 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, 2057438 + ... + 2057451.

It is an arithmetic number, because the mean of its divisors is an integer number (8229780).

Almost surely, 2^28804223 is an apocalyptic number.

28804223 is a deficient number, since it is larger than the sum of its proper divisors (4114897).

28804223 is an equidigital number, since it uses as much as digits as its factorization.

28804223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114896.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28804223 is about 5366.9565863718. The cubic root of 28804223 is about 306.5387542841.

The spelling of 28804223 in words is "twenty-eight million, eight hundred four thousand, two hundred twenty-three".