27565997 has 8 divisors (see below), whose sum is σ = 27873144. Its totient is φ = 27260928.

The previous prime is 27565987. The next prime is 27566047. The reversal of 27565997 is 79956572.

It can be written as a sum of positive squares in 4 ways, for example, as 1901641 + 25664356 = 1379^2 + 5066^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27565997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27565957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44663 + ... + 45275.

It is an arithmetic number, because the mean of its divisors is an integer number (3484143).

Almost surely, 2^27565997 is an apocalyptic number.

It is an amenable number.

27565997 is a deficient number, since it is larger than the sum of its proper divisors (307147).

27565997 is a wasteful number, since it uses less digits than its factorization.

27565997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039.

The product of its digits is 1190700, while the sum is 50.

The square root of 27565997 is about 5250.3330370558. Note that the first 3 decimals coincide. The cubic root of 27565997 is about 302.0818053901.

The spelling of 27565997 in words is "twenty-seven million, five hundred sixty-five thousand, nine hundred ninety-seven".