27687857 has 2 divisors, whose sum is σ = 27687858. Its totient is φ = 27687856.

The previous prime is 27687823. The next prime is 27687859. The reversal of 27687857 is 75878672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 5494336 = 4711^2 + 2344^2 .

It is a cyclic number.

It is not a de Polignac number, because 27687857 - 2⁸ = 27687601 is a prime.

Together with 27687859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27687859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13843928 + 13843929.

It is an arithmetic number, because the mean of its divisors is an integer number (13843929).

Almost surely, 2^27687857 is an apocalyptic number.

It is an amenable number.

27687857 is a deficient number, since it is larger than the sum of its proper divisors (1).

27687857 is an equidigital number, since it uses as much as digits as its factorization.

27687857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1317120, while the sum is 50.

The square root of 27687857 is about 5261.9252180167. The cubic root of 27687857 is about 302.5262850825.

The spelling of 27687857 in words is "twenty-seven million, six hundred eighty-seven thousand, eight hundred fifty-seven".