28285 has 4 divisors (see below), whose sum is σ = 33948. Its totient is φ = 22624.

The previous prime is 28283. The next prime is 28289. The reversal of 28285 is 58282.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6084 + 22201 = 78^2 + 149^2 .

It is a cyclic number.

It is not a de Polignac number, because 28285 - 2¹ = 28283 is a prime.

It is a magnanimous number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2824 + ... + 2833.

It is an arithmetic number, because the mean of its divisors is an integer number (8487).

2²⁸²⁸⁵ is an apocalyptic number.

It is an amenable number.

28285 is a deficient number, since it is larger than the sum of its proper divisors (5663).

28285 is an equidigital number, since it uses as much as digits as its factorization.

28285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5662.

The product of its digits is 1280, while the sum is 25.

The square root of 28285 is about 168.1814496310. The cubic root of 28285 is about 30.4685692516.

It can be divided in two parts, 28 and 285, that added together give a palindrome (313).

The spelling of 28285 in words is "twenty-eight thousand, two hundred eighty-five".