28839 has 4 divisors (see below), whose sum is σ = 38456. Its totient is φ = 19224.

The previous prime is 28837. The next prime is 28843. The reversal of 28839 is 93882.

28839 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 28839 - 2¹ = 28837 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28837) 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, 4804 + ... + 4809.

It is an arithmetic number, because the mean of its divisors is an integer number (9614).

2²⁸⁸³⁹ is an apocalyptic number.

28839 is a deficient number, since it is larger than the sum of its proper divisors (9617).

28839 is an equidigital number, since it uses as much as digits as its factorization.

28839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9616.

The product of its digits is 3456, while the sum is 30.

The square root of 28839 is about 169.8204934630. The cubic root of 28839 is about 30.6662071975. Note that the first 3 decimals are identical.

The spelling of 28839 in words is "twenty-eight thousand, eight hundred thirty-nine".