28135 has 8 divisors (see below), whose sum is σ = 35856. Its totient is φ = 21120.

The previous prime is 28123. The next prime is 28151. The reversal of 28135 is 53182.

28135 = 73² + 74² + ... + 77².

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-28135 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

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, 81 + ... + 250.

It is an arithmetic number, because the mean of its divisors is an integer number (4482).

2²⁸¹³⁵ is an apocalyptic number.

28135 is a deficient number, since it is larger than the sum of its proper divisors (7721).

28135 is a wasteful number, since it uses less digits than its factorization.

28135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353.

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

The square root of 28135 is about 167.7349099025. The cubic root of 28135 is about 30.4146138186.

The spelling of 28135 in words is "twenty-eight thousand, one hundred thirty-five".