28089 has 6 divisors (see below), whose sum is σ = 40586. Its totient is φ = 18720.

The previous prime is 28087. The next prime is 28097. The reversal of 28089 is 98082.

It can be written as a sum of positive squares in only one way, i.e., 14400 + 13689 = 120^2 + 117^2 .

It is not a de Polignac number, because 28089 - 2¹ = 28087 is a prime.

It is a Duffinian number.

It is a Curzon number.

28089 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (28081) 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, 1552 + ... + 1569.

2²⁸⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

28089 is a deficient number, since it is larger than the sum of its proper divisors (12497).

28089 is a wasteful number, since it uses less digits than its factorization.

28089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127 (or 3124 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 28089 is about 167.5977326816. The cubic root of 28089 is about 30.3980290735.

Adding to 28089 its product of nonzero digits (1152), we get a square (29241 = 171²).

The spelling of 28089 in words is "twenty-eight thousand, eighty-nine".