28023 has 4 divisors (see below), whose sum is σ = 37368. Its totient is φ = 18680.

The previous prime is 28019. The next prime is 28027. The reversal of 28023 is 32082.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28019) and next prime (28027).

It is a cyclic number.

It is not a de Polignac number, because 28023 - 2² = 28019 is a prime.

It is a D-number.

28023 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 27993 and 28011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28027) 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 3 ways as a sum of consecutive naturals, for example, 4668 + ... + 4673.

It is an arithmetic number, because the mean of its divisors is an integer number (9342).

2²⁸⁰²³ is an apocalyptic number.

28023 is a deficient number, since it is larger than the sum of its proper divisors (9345).

28023 is an equidigital number, since it uses as much as digits as its factorization.

28023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9344.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 28023 is about 167.4007168443. The cubic root of 28023 is about 30.3742019130.

It can be divided in two parts, 280 and 23, that added together give a palindrome (303).

The spelling of 28023 in words is "twenty-eight thousand, twenty-three".