28158 has 24 divisors (see below), whose sum is σ = 64008. Its totient is φ = 8208.

The previous prime is 28151. The next prime is 28163. The reversal of 28158 is 85182.

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 (28151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1473 + ... + 1491.

It is an arithmetic number, because the mean of its divisors is an integer number (2667).

2²⁸¹⁵⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32004).

28158 is an abundant number, since it is smaller than the sum of its proper divisors (35850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28158 is a wasteful number, since it uses less digits than its factorization.

28158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 37 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 28158 is about 167.8034564602. The cubic root of 28158 is about 30.4228994129.

Adding to 28158 its sum of digits (24), we get a palindrome (28182).

The spelling of 28158 in words is "twenty-eight thousand, one hundred fifty-eight".