27996 has 12 divisors (see below), whose sum is σ = 65352. Its totient is φ = 9328.

The previous prime is 27983. The next prime is 27997. The reversal of 27996 is 69972.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 13.

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 27996.

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

27996 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 in 3 ways as a sum of consecutive naturals, for example, 1155 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (5446).

2²⁷⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

27996 is an abundant number, since it is smaller than the sum of its proper divisors (37356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32676).

27996 is a wasteful number, since it uses less digits than its factorization.

27996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340 (or 2338 counting only the distinct ones).

The product of its digits is 6804, while the sum is 33.

The square root of 27996 is about 167.3200525938. The cubic root of 27996 is about 30.3644436551.

The spelling of 27996 in words is "twenty-seven thousand, nine hundred ninety-six".