27966569 has 2 divisors, whose sum is σ = 27966570. Its totient is φ = 27966568.

The previous prime is 27966541. The next prime is 27966571. The reversal of 27966569 is 96566972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 35344 = 5285^2 + 188^2 .

It is a cyclic number.

It is not a de Polignac number, because 27966569 - 2⁸ = 27966313 is a prime.

It is a super-2 number, since 2×27966569² = 1564257963263522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 27966571, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27966509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13983284 + 13983285.

It is an arithmetic number, because the mean of its divisors is an integer number (13983285).

Almost surely, 2^27966569 is an apocalyptic number.

It is an amenable number.

27966569 is a deficient number, since it is larger than the sum of its proper divisors (1).

27966569 is an equidigital number, since it uses as much as digits as its factorization.

27966569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 50.

The square root of 27966569 is about 5288.3427460784. The cubic root of 27966569 is about 303.5379964316.

The spelling of 27966569 in words is "twenty-seven million, nine hundred sixty-six thousand, five hundred sixty-nine".