28017 has 12 divisors (see below), whose sum is σ = 44304. Its totient is φ = 16920.

The previous prime is 28001. The next prime is 28019. The reversal of 28017 is 71082.

It is not a de Polignac number, because 28017 - 2⁴ = 28001 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28019) 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, 43 + ... + 240.

It is an arithmetic number, because the mean of its divisors is an integer number (3692).

2²⁸⁰¹⁷ is an apocalyptic number.

It is an amenable number.

28017 is a deficient number, since it is larger than the sum of its proper divisors (16287).

28017 is a wasteful number, since it uses less digits than its factorization.

28017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 28017 is about 167.3827948148. The cubic root of 28017 is about 30.3720339531.

Adding to 28017 its reverse (71082), we get a palindrome (99099).

The spelling of 28017 in words is "twenty-eight thousand, seventeen".