28517 has 2 divisors, whose sum is σ = 28518. Its totient is φ = 28516.

The previous prime is 28513. The next prime is 28537. The reversal of 28517 is 71582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27556 + 961 = 166^2 + 31^2 .

It is a cyclic number.

It is not a de Polignac number, because 28517 - 2² = 28513 is a prime.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 28492 and 28501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14258 + 14259.

It is an arithmetic number, because the mean of its divisors is an integer number (14259).

2²⁸⁵¹⁷ is an apocalyptic number.

It is an amenable number.

28517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28517 is an equidigital number, since it uses as much as digits as its factorization.

28517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560, while the sum is 23.

The square root of 28517 is about 168.8697723099. The cubic root of 28517 is about 30.5516459032.

It can be divided in two parts, 28 and 517, that added together give a palindrome (545).

The spelling of 28517 in words is "twenty-eight thousand, five hundred seventeen".