28293 has 4 divisors (see below), whose sum is σ = 37728. Its totient is φ = 18860.

The previous prime is 28289. The next prime is 28297. The reversal of 28293 is 39282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28289) and next prime (28297).

It is a cyclic number.

It is not a de Polignac number, because 28293 - 2² = 28289 is a prime.

It is a D-number.

28293 is a lucky number.

It is a plaindrome in base 12.

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 (28297) 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, 4713 + ... + 4718.

It is an arithmetic number, because the mean of its divisors is an integer number (9432).

2²⁸²⁹³ is an apocalyptic number.

It is an amenable number.

28293 is a deficient number, since it is larger than the sum of its proper divisors (9435).

28293 is an equidigital number, since it uses as much as digits as its factorization.

28293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9434.

The product of its digits is 864, while the sum is 24.

The square root of 28293 is about 168.2052317855. The cubic root of 28293 is about 30.4714415111.

The spelling of 28293 in words is "twenty-eight thousand, two hundred ninety-three".