28518 has 24 divisors (see below), whose sum is σ = 67032. Its totient is φ = 8064.

The previous prime is 28517. The next prime is 28537. The reversal of 28518 is 81582.

28518 is a modest number, since divided by 518 gives 28 as remainder.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28513) 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, 246 + ... + 342.

It is an arithmetic number, because the mean of its divisors is an integer number (2793).

2²⁸⁵¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33516).

28518 is an abundant number, since it is smaller than the sum of its proper divisors (38514).

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

28518 is a wasteful number, since it uses less digits than its factorization.

With its successor (28519) it forms an eRAP, since the sums of their prime factors are consecutive (116 and 117).

28518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116 (or 109 counting only the distinct ones).

The product of its digits is 640, while the sum is 24.

The square root of 28518 is about 168.8727331454. The cubic root of 28518 is about 30.5520030152.

It can be divided in two parts, 285 and 18, that added together give a palindrome (303).

The spelling of 28518 in words is "twenty-eight thousand, five hundred eighteen".