28845 has 12 divisors (see below), whose sum is σ = 50076. Its totient is φ = 15360.

The previous prime is 28843. The next prime is 28859. The reversal of 28845 is 54882.

28845 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 19044 + 9801 = 138^2 + 99^2 .

It is not a de Polignac number, because 28845 - 2¹ = 28843 is a prime.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28843) 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, 276 + ... + 365.

It is an arithmetic number, because the mean of its divisors is an integer number (4173).

2²⁸⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

28845 is a deficient number, since it is larger than the sum of its proper divisors (21231).

28845 is a wasteful number, since it uses less digits than its factorization.

28845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 649 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 28845 is about 169.8381582566. The cubic root of 28845 is about 30.6683337678.

It can be divided in two parts, 288 and 45, that added together give a palindrome (333).

The spelling of 28845 in words is "twenty-eight thousand, eight hundred forty-five".