27998 has 4 divisors (see below), whose sum is σ = 42000. Its totient is φ = 13998.

The previous prime is 27997. The next prime is 28001. The reversal of 27998 is 89972.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 27998.

It is not an unprimeable number, because it can be changed into a prime (27997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6998 + ... + 7001.

It is an arithmetic number, because the mean of its divisors is an integer number (10500).

2²⁷⁹⁹⁸ is an apocalyptic number.

27998 is a deficient number, since it is larger than the sum of its proper divisors (14002).

27998 is a wasteful number, since it uses less digits than its factorization.

27998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14001.

The product of its digits is 9072, while the sum is 35.

The square root of 27998 is about 167.3260290570. The cubic root of 27998 is about 30.3651667042.

It can be divided in two parts, 2 and 7998, that added together give a cube (8000 = 20³).

The spelling of 27998 in words is "twenty-seven thousand, nine hundred ninety-eight".