28044223 has 4 divisors (see below), whose sum is σ = 28246120. Its totient is φ = 27842328.

The previous prime is 28044217. The next prime is 28044239. The reversal of 28044223 is 32244082.

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 28044223 - 2⁹ = 28043711 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 (28044253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100740 + ... + 101017.

It is an arithmetic number, because the mean of its divisors is an integer number (7061530).

Almost surely, 2^28044223 is an apocalyptic number.

28044223 is a deficient number, since it is larger than the sum of its proper divisors (201897).

28044223 is a wasteful number, since it uses less digits than its factorization.

28044223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201896.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 28044223 is about 5295.6796542087. The cubic root of 28044223 is about 303.8186786622.

The spelling of 28044223 in words is "twenty-eight million, forty-four thousand, two hundred twenty-three".