28243 has 4 divisors (see below), whose sum is σ = 28768. Its totient is φ = 27720.

The previous prime is 28229. The next prime is 28277. The reversal of 28243 is 34282.

It is a happy number.

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 28243 - 2⁵ = 28211 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 28243.

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 3 ways as a sum of consecutive naturals, for example, 171 + ... + 292.

It is an arithmetic number, because the mean of its divisors is an integer number (7192).

2²⁸²⁴³ is an apocalyptic number.

28243 is a deficient number, since it is larger than the sum of its proper divisors (525).

28243 is an equidigital number, since it uses as much as digits as its factorization.

28243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524.

The product of its digits is 384, while the sum is 19.

The square root of 28243 is about 168.0565381055. The cubic root of 28243 is about 30.4534809972.

Subtracting from 28243 its sum of digits (19), we obtain a square (28224 = 168²).

It can be divided in two parts, 282 and 43, that added together give a triangular number (325 = T₂₅).

The spelling of 28243 in words is "twenty-eight thousand, two hundred forty-three".