28365 has 16 divisors (see below), whose sum is σ = 47616. Its totient is φ = 14400.

The previous prime is 28351. The next prime is 28387. The reversal of 28365 is 56382.

It is not a de Polignac number, because 28365 - 2⁴ = 28349 is a prime.

It is a Curzon number.

28365 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435 + ... + 495.

It is an arithmetic number, because the mean of its divisors is an integer number (2976).

2²⁸³⁶⁵ is an apocalyptic number.

It is an amenable number.

28365 is a deficient number, since it is larger than the sum of its proper divisors (19251).

28365 is a wasteful number, since it uses less digits than its factorization.

28365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100.

The product of its digits is 1440, while the sum is 24.

The square root of 28365 is about 168.4191200547. The cubic root of 28365 is about 30.4972675148.

It can be divided in two parts, 28 and 365, that added together give a palindrome (393).

The spelling of 28365 in words is "twenty-eight thousand, three hundred sixty-five".