28456223 has 4 divisors (see below), whose sum is σ = 28484400. Its totient is φ = 28428048.

The previous prime is 28456193. The next prime is 28456229. The reversal of 28456223 is 32265482.

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 28456223 - 2⁶ = 28456159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28456223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28456229) 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, 12515 + ... + 14612.

It is an arithmetic number, because the mean of its divisors is an integer number (7121100).

Almost surely, 2^28456223 is an apocalyptic number.

28456223 is a deficient number, since it is larger than the sum of its proper divisors (28177).

28456223 is a wasteful number, since it uses less digits than its factorization.

28456223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28176.

The product of its digits is 23040, while the sum is 32.

The square root of 28456223 is about 5334.4374586267. The cubic root of 28456223 is about 305.2992601590.

The spelling of 28456223 in words is "twenty-eight million, four hundred fifty-six thousand, two hundred twenty-three".