27988 has 6 divisors (see below), whose sum is σ = 48986. Its totient is φ = 13992.

The previous prime is 27983. The next prime is 27997. The reversal of 27988 is 88972.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21904 + 6084 = 148^2 + 78^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27983) by changing a digit.

27988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495 + ... + 3502.

2²⁷⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

27988 is a deficient number, since it is larger than the sum of its proper divisors (20998).

27988 is a wasteful number, since it uses less digits than its factorization.

27988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7001 (or 6999 counting only the distinct ones).

The product of its digits is 8064, while the sum is 34.

The square root of 27988 is about 167.2961446059. The cubic root of 27988 is about 30.3615511147.

The spelling of 27988 in words is "twenty-seven thousand, nine hundred eighty-eight".