28398 has 8 divisors (see below), whose sum is σ = 56808. Its totient is φ = 9464.

The previous prime is 28393. The next prime is 28403. The reversal of 28398 is 89382.

28398 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (28393) and next prime (28403).

It is a sphenic number, since it is the product of 3 distinct primes.

28398 is an admirable number.

It is a plaindrome in base 16.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2361 + ... + 2372.

It is an arithmetic number, because the mean of its divisors is an integer number (7101).

2²⁸³⁹⁸ is an apocalyptic number.

28398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28404).

28398 is a wasteful number, since it uses less digits than its factorization.

28398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4738.

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

The square root of 28398 is about 168.5170614508. The cubic root of 28398 is about 30.5090898286.

Subtracting from 28398 its product of digits (3456), we obtain a palindrome (24942).

The spelling of 28398 in words is "twenty-eight thousand, three hundred ninety-eight".