27315565 has 12 divisors (see below), whose sum is σ = 33302556. Its totient is φ = 21508608.

The previous prime is 27315527. The next prime is 27315569. The reversal of 27315565 is 56551372.

It can be written as a sum of positive squares in 2 ways, for example, as 9498724 + 17816841 = 3082^2 + 4221^2 .

It is not a de Polignac number, because 27315565 - 2¹⁵ = 27282797 is a prime.

It is a super-2 number, since 2×27315565² = 1492280182538450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27315565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27315569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21837 + ... + 23053.

It is an arithmetic number, because the mean of its divisors is an integer number (2775213).

Almost surely, 2^27315565 is an apocalyptic number.

It is an amenable number.

27315565 is a deficient number, since it is larger than the sum of its proper divisors (5986991).

27315565 is an equidigital number, since it uses as much as digits as its factorization.

27315565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1289 counting only the distinct ones).

The product of its digits is 31500, while the sum is 34.

The square root of 27315565 is about 5226.4294695327. The cubic root of 27315565 is about 301.1642352687.

The spelling of 27315565 in words is "twenty-seven million, three hundred fifteen thousand, five hundred sixty-five".