28028 has 36 divisors (see below), whose sum is σ = 67032. Its totient is φ = 10080.

The previous prime is 28027. The next prime is 28031. The reversal of 28028 is 82082.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28027) 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, 2150 + ... + 2162.

It is an arithmetic number, because the mean of its divisors is an integer number (1862).

2²⁸⁰²⁸ is an apocalyptic number.

28028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33516).

28028 is an abundant number, since it is smaller than the sum of its proper divisors (39004).

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

28028 is a wasteful number, since it uses less digits than its factorization.

28028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 28028 is about 167.4156504034. The cubic root of 28028 is about 30.3760083099.

Subtracting from 28028 its product of nonzero digits (256), we obtain a palindrome (27772).

The spelling of 28028 in words is "twenty-eight thousand, twenty-eight".