27860681 has 2 divisors, whose sum is σ = 27860682. Its totient is φ = 27860680.

The previous prime is 27860653. The next prime is 27860683. The reversal of 27860681 is 18606872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15015625 + 12845056 = 3875^2 + 3584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27860681 is a prime.

It is a super-2 number, since 2×27860681² = 1552435091567522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 27860683, 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 (27860683) 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 as a sum of consecutive naturals, namely, 13930340 + 13930341.

It is an arithmetic number, because the mean of its divisors is an integer number (13930341).

Almost surely, 2^27860681 is an apocalyptic number.

It is an amenable number.

27860681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27860681 is an equidigital number, since it uses as much as digits as its factorization.

27860681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 27860681 is about 5278.3217976929. The cubic root of 27860681 is about 303.1544232041.

The spelling of 27860681 in words is "twenty-seven million, eight hundred sixty thousand, six hundred eighty-one".