28556 has 18 divisors (see below), whose sum is σ = 55860. Its totient is φ = 12760.

The previous prime is 28549. The next prime is 28559. The reversal of 28556 is 65582.

28556 = T₂₄ + T₂₅ + ... + T₅₆.

It is a nialpdrome in base 13.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (28559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 455 + ... + 513.

28556 is a Friedman number, since it can be written as (8+5)^(6-2)-5, using all its digits and the basic arithmetic operations.

2²⁸⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

28556 is a deficient number, since it is larger than the sum of its proper divisors (27304).

28556 is a wasteful number, since it uses less digits than its factorization.

28556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85 (or 72 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 28556 is about 168.9852064531. The cubic root of 28556 is about 30.5655670897.

Adding to 28556 its sum of digits (26), we get a palindrome (28582).

It can be divided in two parts, 2 and 8556, that added together give a palindrome (8558).

The spelling of 28556 in words is "twenty-eight thousand, five hundred fifty-six".