28415 has 4 divisors (see below), whose sum is σ = 34104. Its totient is φ = 22728.

The previous prime is 28411. The next prime is 28429. The reversal of 28415 is 51482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51482 = 2 ⋅25741.

It is a cyclic number.

It is not a de Polignac number, because 28415 - 2² = 28411 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2837 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (8526).

2²⁸⁴¹⁵ is an apocalyptic number.

28415 is a deficient number, since it is larger than the sum of its proper divisors (5689).

28415 is an equidigital number, since it uses as much as digits as its factorization.

28415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5688.

The product of its digits is 320, while the sum is 20.

The square root of 28415 is about 168.5674939008. The cubic root of 28415 is about 30.5151765373.

Adding to 28415 its reverse (51482), we get a palindrome (79897).

The spelling of 28415 in words is "twenty-eight thousand, four hundred fifteen".