27663 has 4 divisors (see below), whose sum is σ = 36888. Its totient is φ = 18440.

The previous prime is 27653. The next prime is 27673. The reversal of 27663 is 36672.

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

It is an interprime number because it is at equal distance from previous prime (27653) and next prime (27673).

It is a cyclic number.

It is not a de Polignac number, because 27663 - 2⁴ = 27647 is a prime.

It is a D-number.

27663 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27653) 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, 4608 + ... + 4613.

It is an arithmetic number, because the mean of its divisors is an integer number (9222).

2²⁷⁶⁶³ is an apocalyptic number.

27663 is a deficient number, since it is larger than the sum of its proper divisors (9225).

27663 is an equidigital number, since it uses as much as digits as its factorization.

27663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9224.

The product of its digits is 1512, while the sum is 24.

The square root of 27663 is about 166.3219769002. The cubic root of 27663 is about 30.2435726162.

Subtracting 27663 from its reverse (36672), we obtain a palindrome (9009).

The spelling of 27663 in words is "twenty-seven thousand, six hundred sixty-three".