27818 has 8 divisors (see below), whose sum is σ = 47712. Its totient is φ = 11916.

The previous prime is 27817. The next prime is 27823. The reversal of 27818 is 81872.

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

It is a super-2 number, since 2×27818² = 1547682248, which contains 22 as substring.

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

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (27817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980 + ... + 1007.

It is an arithmetic number, because the mean of its divisors is an integer number (5964).

2²⁷⁸¹⁸ is an apocalyptic number.

27818 is a deficient number, since it is larger than the sum of its proper divisors (19894).

27818 is a wasteful number, since it uses less digits than its factorization.

27818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996.

The product of its digits is 896, while the sum is 26.

The square root of 27818 is about 166.7872896836. The cubic root of 27818 is about 30.2999538897.

The spelling of 27818 in words is "twenty-seven thousand, eight hundred eighteen".