28245 has 16 divisors (see below), whose sum is σ = 51840. Its totient is φ = 12864.

The previous prime is 28229. The next prime is 28277. The reversal of 28245 is 54282.

28245 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 28245 - 2^{4} = 28229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a d-powerful number, because it can be written as **2**^{5} + **8**^{3} + **2**^{13} + **4**^{7} + **5**^{5} .

28245 is a lucky number.

It is a zygodrome in base 6.

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, 30 + ... + 239.

It is an arithmetic number, because the mean of its divisors is an integer number (3240).

2^{28245} is an apocalyptic number.

It is an amenable number.

28245 is a deficient number, since it is larger than the sum of its proper divisors (23595).

28245 is a wasteful number, since it uses less digits than its factorization.

28245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284.

The product of its digits is 640, while the sum is 21.

The square root of 28245 is about 168.0624883786. The cubic root of 28245 is about 30.4541998246.

Subtracting from 28245 its sum of digits (21), we obtain a square (28224 = 168^{2}).

The spelling of 28245 in words is "twenty-eight thousand, two hundred forty-five".

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