28889 has 4 divisors (see below), whose sum is σ = 33024. Its totient is φ = 24756.

The previous prime is 28879. The next prime is 28901. The reversal of 28889 is 98882.

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 a cyclic number.

It is not a de Polignac number, because 28889 - 2¹² = 24793 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (28859) 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, 2057 + ... + 2070.

It is an arithmetic number, because the mean of its divisors is an integer number (8256).

2²⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

28889 is a deficient number, since it is larger than the sum of its proper divisors (4135).

28889 is an equidigital number, since it uses as much as digits as its factorization.

28889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134.

The product of its digits is 9216, while the sum is 35.

The square root of 28889 is about 169.9676439797. The cubic root of 28889 is about 30.6839196133.

The spelling of 28889 in words is "twenty-eight thousand, eight hundred eighty-nine".