27289 has 4 divisors (see below), whose sum is σ = 28260. Its totient is φ = 26320.

The previous prime is 27283. The next prime is 27299. The reversal of 27289 is 98272.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15625 + 11664 = 125^2 + 108^2 .

It is a cyclic number.

It is not a de Polignac number, because 27289 - 2³ = 27281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27281) 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, 442 + ... + 499.

It is an arithmetic number, because the mean of its divisors is an integer number (7065).

2²⁷²⁸⁹ is an apocalyptic number.

27289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27289 is a deficient number, since it is larger than the sum of its proper divisors (971).

27289 is an equidigital number, since it uses as much as digits as its factorization.

27289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its digits is 2016, while the sum is 28.

The square root of 27289 is about 165.1938255505. The cubic root of 27289 is about 30.1066573943.

Subtracting from 27289 its sum of digits (28), we obtain a triangular number (27261 = T₂₃₃).

It can be divided in two parts, 272 and 89, that added together give a square (361 = 19²).

The spelling of 27289 in words is "twenty-seven thousand, two hundred eighty-nine".