28318 has 4 divisors (see below), whose sum is σ = 42480. Its totient is φ = 14158.

The previous prime is 28309. The next prime is 28319. The reversal of 28318 is 81382.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 12.

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 (28319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7078 + ... + 7081.

It is an arithmetic number, because the mean of its divisors is an integer number (10620).

2²⁸³¹⁸ is an apocalyptic number.

28318 is a deficient number, since it is larger than the sum of its proper divisors (14162).

28318 is a wasteful number, since it uses less digits than its factorization.

28318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14161.

The product of its digits is 384, while the sum is 22.

The square root of 28318 is about 168.2795293552. The cubic root of 28318 is about 30.4804138337.

The spelling of 28318 in words is "twenty-eight thousand, three hundred eighteen".