27771857 has 2 divisors, whose sum is σ = 27771858. Its totient is φ = 27771856.

The previous prime is 27771853. The next prime is 27771859. The reversal of 27771857 is 75817772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25240576 + 2531281 = 5024^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 27771857 - 2² = 27771853 is a prime.

Together with 27771859, 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 (27771853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885928 + 13885929.

It is an arithmetic number, because the mean of its divisors is an integer number (13885929).

Almost surely, 2^27771857 is an apocalyptic number.

It is an amenable number.

27771857 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771857 is an equidigital number, since it uses as much as digits as its factorization.

27771857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192080, while the sum is 44.

The square root of 27771857 is about 5269.9010427142. The cubic root of 27771857 is about 302.8319130753.

The spelling of 27771857 in words is "twenty-seven million, seven hundred seventy-one thousand, eight hundred fifty-seven".