28215 has 32 divisors (see below), whose sum is σ = 57600. Its totient is φ = 12960.

The previous prime is 28211. The next prime is 28219. The reversal of 28215 is 51282.

It is an interprime number because it is at equal distance from previous prime (28211) and next prime (28219).

It is not a de Polignac number, because 28215 - 2² = 28211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1476 + ... + 1494.

It is an arithmetic number, because the mean of its divisors is an integer number (1800).

2²⁸²¹⁵ is an apocalyptic number.

28215 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28800).

28215 is a wasteful number, since it uses less digits than its factorization.

28215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44 (or 38 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 28215 is about 167.9732121500. The cubic root of 28215 is about 30.4434138489.

Adding to 28215 its reverse (51282), we get a palindrome (79497).

It can be divided in two parts, 28 and 215, that added together give a 5-th power (243 = 3⁵).

The spelling of 28215 in words is "twenty-eight thousand, two hundred fifteen".