28315 has 8 divisors (see below), whose sum is σ = 38880. Its totient is φ = 19392.

The previous prime is 28309. The next prime is 28319. The reversal of 28315 is 51382.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28315 - 2³ = 28307 is a prime.

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 = 28292 and 28301.

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 7 ways as a sum of consecutive naturals, for example, 370 + ... + 439.

It is an arithmetic number, because the mean of its divisors is an integer number (4860).

2²⁸³¹⁵ is an apocalyptic number.

28315 is a deficient number, since it is larger than the sum of its proper divisors (10565).

28315 is an equidigital number, since it uses as much as digits as its factorization.

28315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821.

The product of its digits is 240, while the sum is 19.

The square root of 28315 is about 168.2706153789. The cubic root of 28315 is about 30.4793374339.

Adding to 28315 its reverse (51382), we get a palindrome (79697).

It can be divided in two parts, 28 and 315, that added together give a palindrome (343).

The spelling of 28315 in words is "twenty-eight thousand, three hundred fifteen".