28223 has 6 divisors (see below), whose sum is σ = 30744. Its totient is φ = 25896.

The previous prime is 28219. The next prime is 28229. The reversal of 28223 is 32282.

It is a Cunningham number, because it is equal to 168²-1.

It is not a de Polignac number, because 28223 - 2² = 28219 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86 + ... + 252.

It is an arithmetic number, because the mean of its divisors is an integer number (5124).

2²⁸²²³ is an apocalyptic number.

28223 is a deficient number, since it is larger than the sum of its proper divisors (2521).

28223 is a wasteful number, since it uses less digits than its factorization.

28223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 180 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 28223 is about 167.9970237832. The cubic root of 28223 is about 30.4462908564.

The spelling of 28223 in words is "twenty-eight thousand, two hundred twenty-three".