28790223 has 16 divisors (see below), whose sum is σ = 47859456. Its totient is φ = 14955840.

The previous prime is 28790221. The next prime is 28790239. The reversal of 28790223 is 32209782.

It is not a de Polignac number, because 28790223 - 2¹ = 28790221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28790221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62086 + ... + 62547.

It is an arithmetic number, because the mean of its divisors is an integer number (2991216).

Almost surely, 2^28790223 is an apocalyptic number.

28790223 is a deficient number, since it is larger than the sum of its proper divisors (19069233).

28790223 is a wasteful number, since it uses less digits than its factorization.

28790223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124654.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 28790223 is about 5365.6521504846. The cubic root of 28790223 is about 306.4890828866.

The spelling of 28790223 in words is "twenty-eight million, seven hundred ninety thousand, two hundred twenty-three".