27856 has 10 divisors (see below), whose sum is σ = 54002. Its totient is φ = 13920.

The previous prime is 27851. The next prime is 27883. The reversal of 27856 is 65872.

It can be written as a sum of positive squares in only one way, i.e., 14400 + 13456 = 120^2 + 116^2 .

It is a d-powerful number, because it can be written as 2⁴ + 7³ + 8⁴ + 5⁶ + 6⁵ .

It is an alternating number because its digits alternate between even and odd.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27851) 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, 855 + ... + 886.

2²⁷⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

27856 is a deficient number, since it is larger than the sum of its proper divisors (26146).

27856 is a wasteful number, since it uses less digits than its factorization.

27856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1749 (or 1743 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 27856 is about 166.9011683602. The cubic root of 27856 is about 30.3137444134.

The spelling of 27856 in words is "twenty-seven thousand, eight hundred fifty-six".