28917 has 24 divisors (see below), whose sum is σ = 52416. Its totient is φ = 15552.

The previous prime is 28909. The next prime is 28921. The reversal of 28917 is 71982.

It is not a de Polignac number, because 28917 - 2³ = 28909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 12.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28927) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1693 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (2184).

2²⁸⁹¹⁷ is an apocalyptic number.

28917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28917 is a deficient number, since it is larger than the sum of its proper divisors (23499).

28917 is an equidigital number, since it uses as much as digits as its factorization.

28917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39 (or 27 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 28917 is about 170.0499926492. The cubic root of 28917 is about 30.6938296405.

It can be divided in two parts, 289 and 17, that multiplied together give a cube (4913 = 17³).

The spelling of 28917 in words is "twenty-eight thousand, nine hundred seventeen".