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28317 = 39439

28317 has 4 divisors (see below), whose sum is σ = 37760. Its totient is φ = 18876.

The previous prime is 28309. The next prime is 28319. The reversal of 28317 is 71382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28317 - 23 = 28309 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 28293 and 28302.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28317.

It is not an unprimeable number, because it can be changed into a prime (28319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4717 + ... + 4722.

It is an arithmetic number, because the mean of its divisors is an integer number (9440).

228317 is an apocalyptic number.

It is an amenable number.

28317 is a deficient number, since it is larger than the sum of its proper divisors (9443).

28317 is an equidigital number, since it uses as much as digits as its factorization.

28317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9442.

The product of its digits is 336, while the sum is 21.

The square root of 28317 is about 168.2765580822. The cubic root of 28317 is about 30.4800550422.

Adding to 28317 its reverse (71382), we get a palindrome (99699).

It can be divided in two parts, 283 and 17, that added together give a triangular number (300 = T24).

The spelling of 28317 in words is "twenty-eight thousand, three hundred seventeen".

Divisors: 1 3 9439 28317