27665 has 8 divisors (see below), whose sum is σ = 36288. Its totient is φ = 20080.

The previous prime is 27653. The next prime is 27673. The reversal of 27665 is 56672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27665 - 2⁸ = 27409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197 + ... + 306.

It is an arithmetic number, because the mean of its divisors is an integer number (4536).

2²⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

27665 is a deficient number, since it is larger than the sum of its proper divisors (8623).

27665 is a wasteful number, since it uses less digits than its factorization.

27665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519.

The product of its digits is 2520, while the sum is 26.

The square root of 27665 is about 166.3279892261. The cubic root of 27665 is about 30.2443014560.

It can be divided in two parts, 27 and 665, that multiplied together give a triangular number (17955 = T₁₈₉).

The spelling of 27665 in words is "twenty-seven thousand, six hundred sixty-five".