27788 has 6 divisors (see below), whose sum is σ = 48636. Its totient is φ = 13892.

The previous prime is 27779. The next prime is 27791. The reversal of 27788 is 88772.

It is a happy number.

It is a plaindrome in base 10.

It is an unprimeable number.

27788 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 3470 + ... + 3477.

It is an arithmetic number, because the mean of its divisors is an integer number (8106).

2²⁷⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

27788 is a deficient number, since it is larger than the sum of its proper divisors (20848).

27788 is a wasteful number, since it uses less digits than its factorization.

27788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6951 (or 6949 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 27788 is about 166.6973305125. The cubic root of 27788 is about 30.2890577604.

It can be divided in two parts, 2 and 7788, that multiplied together give a triangular number (15576 = T₁₇₆).

The spelling of 27788 in words is "twenty-seven thousand, seven hundred eighty-eight".