27776565 has 12 divisors (see below), whose sum is σ = 48146124. Its totient is φ = 14814144.

The previous prime is 27776513. The next prime is 27776587. The reversal of 27776565 is 56567772.

It can be written as a sum of positive squares in 2 ways, for example, as 20711601 + 7064964 = 4551^2 + 2658^2 .

It is not a de Polignac number, because 27776565 - 2⁶ = 27776501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 617257 = 27776565 / (2 + 7 + 7 + 7 + 6 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 27776565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308584 + ... + 308673.

It is an arithmetic number, because the mean of its divisors is an integer number (4012177).

Almost surely, 2^27776565 is an apocalyptic number.

It is an amenable number.

27776565 is a deficient number, since it is larger than the sum of its proper divisors (20369559).

27776565 is a wasteful number, since it uses less digits than its factorization.

27776565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617268 (or 617265 counting only the distinct ones).

The product of its digits is 617400, while the sum is 45.

The square root of 27776565 is about 5270.3477114893. The cubic root of 27776565 is about 302.8490245476.

The spelling of 27776565 in words is "twenty-seven million, seven hundred seventy-six thousand, five hundred sixty-five".