28856 has 8 divisors (see below), whose sum is σ = 54120. Its totient is φ = 14424.

The previous prime is 28843. The next prime is 28859. The reversal of 28856 is 65882.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1796 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (6765).

2²⁸⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

28856 is a deficient number, since it is larger than the sum of its proper divisors (25264).

28856 is a wasteful number, since it uses less digits than its factorization.

28856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613 (or 3609 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 28856 is about 169.8705389407. The cubic root of 28856 is about 30.6722317143.

The spelling of 28856 in words is "twenty-eight thousand, eight hundred fifty-six".