28056 has 32 divisors (see below), whose sum is σ = 80640. Its totient is φ = 7968.

The previous prime is 28051. The next prime is 28057. The reversal of 28056 is 65082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 8 and base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051) by changing a digit.

28056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85 + ... + 251.

It is an arithmetic number, because the mean of its divisors is an integer number (2520).

2²⁸⁰⁵⁶ is an apocalyptic number.

It is a pronic number, being equal to 167×168.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40320).

28056 is an abundant number, since it is smaller than the sum of its proper divisors (52584).

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

28056 is a wasteful number, since it uses less digits than its factorization.

28056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28056 is about 167.4992537297. The cubic root of 28056 is about 30.3861201643.

The spelling of 28056 in words is "twenty-eight thousand, fifty-six".