28015 has 8 divisors (see below), whose sum is σ = 36288. Its totient is φ = 20640.

The previous prime is 28001. The next prime is 28019. The reversal of 28015 is 51082.

28015 = 36² + 37² + ... + 50².

It is a happy number.

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

It is not a de Polignac number, because 28015 - 2⁵ = 27983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151 + ... + 280.

It is an arithmetic number, because the mean of its divisors is an integer number (4536).

2²⁸⁰¹⁵ is an apocalyptic number.

28015 is a deficient number, since it is larger than the sum of its proper divisors (8273).

28015 is a wasteful number, since it uses less digits than its factorization.

28015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 28015 is about 167.3768203785. The cubic root of 28015 is about 30.3713112311.

Adding to 28015 its reverse (51082), we get a palindrome (79097).

The spelling of 28015 in words is "twenty-eight thousand, fifteen".