28055 has 8 divisors (see below), whose sum is σ = 34944. Its totient is φ = 21600.

The previous prime is 28051. The next prime is 28057. The reversal of 28055 is 55082.

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

It is not a de Polignac number, because 28055 - 2² = 28051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 28055.

It is not an unprimeable number, because it can be changed into a prime (28051) 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, 65 + ... + 245.

It is an arithmetic number, because the mean of its divisors is an integer number (4368).

2²⁸⁰⁵⁵ is an apocalyptic number.

28055 is a deficient number, since it is larger than the sum of its proper divisors (6889).

28055 is a wasteful number, since it uses less digits than its factorization.

28055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 28055 is about 167.4962686152. The cubic root of 28055 is about 30.3857591425.

It can be divided in two parts, 280 and 55, that multiplied together give a triangular number (15400 = T₁₇₅).

The spelling of 28055 in words is "twenty-eight thousand, fifty-five".