28104 has 16 divisors (see below), whose sum is σ = 70320. Its totient is φ = 9360.

The previous prime is 28099. The next prime is 28109. The reversal of 28104 is 40182.

28104 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (28099) and next prime (28109).

It is a hoax number, since the sum of its digits (15) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28104.

It is not an unprimeable number, because it can be changed into a prime (28109) 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, 562 + ... + 609.

It is an arithmetic number, because the mean of its divisors is an integer number (4395).

2²⁸¹⁰⁴ is an apocalyptic number.

28104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28104 is an abundant number, since it is smaller than the sum of its proper divisors (42216).

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 (35160).

28104 is a wasteful number, since it uses less digits than its factorization.

28104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 28104 is about 167.6424767176. The cubic root of 28104 is about 30.4034391308.

Adding to 28104 its reverse (40182), we get a palindrome (68286).

The spelling of 28104 in words is "twenty-eight thousand, one hundred four".