27864289 has 4 divisors (see below), whose sum is σ = 27875524. Its totient is φ = 27853056.

The previous prime is 27864269. The next prime is 27864299. The reversal of 27864289 is 98246872.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6630625 + 21233664 = 2575^2 + 4608^2 .

It is a cyclic number.

It is not a de Polignac number, because 27864289 - 2⁹ = 27863777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27864259) 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, 72 + ... + 7465.

It is an arithmetic number, because the mean of its divisors is an integer number (6968881).

Almost surely, 2^27864289 is an apocalyptic number.

It is an amenable number.

27864289 is a deficient number, since it is larger than the sum of its proper divisors (11235).

27864289 is an equidigital number, since it uses as much as digits as its factorization.

27864289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11234.

The product of its digits is 387072, while the sum is 46.

The square root of 27864289 is about 5278.6635619255. The cubic root of 27864289 is about 303.1675089568.

The spelling of 27864289 in words is "twenty-seven million, eight hundred sixty-four thousand, two hundred eighty-nine".