27861 has 8 divisors (see below), whose sum is σ = 38304. Its totient is φ = 18000.

The previous prime is 27851. The next prime is 27883. The reversal of 27861 is 16872.

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

It is not a de Polignac number, because 27861 - 2⁷ = 27733 is a prime.

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 (27851) 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, 15 + ... + 236.

It is an arithmetic number, because the mean of its divisors is an integer number (4788).

2²⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

27861 is a deficient number, since it is larger than the sum of its proper divisors (10443).

27861 is a wasteful number, since it uses less digits than its factorization.

27861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291.

The product of its digits is 672, while the sum is 24.

The square root of 27861 is about 166.9161466126. The cubic root of 27861 is about 30.3155580222.

It can be divided in two parts, 27 and 861, that added together give a palindrome (888).

The spelling of 27861 in words is "twenty-seven thousand, eight hundred sixty-one".