28868 has 12 divisors (see below), whose sum is σ = 57792. Its totient is φ = 12360.

The previous prime is 28867. The next prime is 28871. The reversal of 28868 is 86882.

28868 is an admirable number.

It is a super-2 number, since 2×28868² = 1666722848, which contains 22 as substring.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28868.

It is not an unprimeable number, because it can be changed into a prime (28867) 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, 488 + ... + 543.

It is an arithmetic number, because the mean of its divisors is an integer number (4816).

2²⁸⁸⁶⁸ is an apocalyptic number.

28868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28868 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 (28896).

28868 is a wasteful number, since it uses less digits than its factorization.

28868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1040 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 28868 is about 169.9058562852. The cubic root of 28868 is about 30.6764828899.

Adding to 28868 its sum of digits (32), we get a square (28900 = 170²).

The spelling of 28868 in words is "twenty-eight thousand, eight hundred sixty-eight".