28938 has 32 divisors (see below), whose sum is σ = 72576. Its totient is φ = 7488.

The previous prime is 28933. The next prime is 28949. The reversal of 28938 is 83982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 572.

It is an arithmetic number, because the mean of its divisors is an integer number (2268).

2²⁸⁹³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36288).

28938 is an abundant number, since it is smaller than the sum of its proper divisors (43638).

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

28938 is a wasteful number, since it uses less digits than its factorization.

28938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78.

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

The square root of 28938 is about 170.1117279908. Note that the first 3 decimals coincide. The cubic root of 28938 is about 30.7012579636.

The spelling of 28938 in words is "twenty-eight thousand, nine hundred thirty-eight".