28818 has 12 divisors (see below), whose sum is σ = 62478. Its totient is φ = 9600.

The previous prime is 28817. The next prime is 28837. The reversal of 28818 is 81882.

It can be written as a sum of positive squares in only one way, i.e., 15129 + 13689 = 123^2 + 117^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28791 and 28800.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28818.

It is not an unprimeable number, because it can be changed into a prime (28813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 783 + ... + 818.

2²⁸⁸¹⁸ is an apocalyptic number.

28818 is an abundant number, since it is smaller than the sum of its proper divisors (33660).

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

28818 is a wasteful number, since it uses less digits than its factorization.

28818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1606 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 28818 is about 169.7586522095. The cubic root of 28818 is about 30.6587618777.

It can be divided in two parts, 288 and 18, that multiplied together give a square (5184 = 72²).

The spelling of 28818 in words is "twenty-eight thousand, eight hundred eighteen".