28233 has 6 divisors (see below), whose sum is σ = 40794. Its totient is φ = 18816.

The previous prime is 28229. The next prime is 28277. The reversal of 28233 is 33282.

It can be written as a sum of positive squares in only one way, i.e., 28224 + 9 = 168^2 + 3^2 .

It is not a de Polignac number, because 28233 - 2² = 28229 is a prime.

It is an Ulam number.

It is a Curzon number.

28233 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (28283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1560 + ... + 1577.

It is an arithmetic number, because the mean of its divisors is an integer number (6799).

2²⁸²³³ is an apocalyptic number.

It is an amenable number.

28233 is a deficient number, since it is larger than the sum of its proper divisors (12561).

28233 is a wasteful number, since it uses less digits than its factorization.

28233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143 (or 3140 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 28233 is about 168.0267835793. The cubic root of 28233 is about 30.4498863513.

The spelling of 28233 in words is "twenty-eight thousand, two hundred thirty-three".