27691847 has 2 divisors, whose sum is σ = 27691848. Its totient is φ = 27691846.

The previous prime is 27691831. The next prime is 27691849. The reversal of 27691847 is 74819672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27691847 - 2⁴ = 27691831 is a prime.

Together with 27691849, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27691798 and 27691807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27691849) 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, 13845923 + 13845924.

It is an arithmetic number, because the mean of its divisors is an integer number (13845924).

Almost surely, 2^27691847 is an apocalyptic number.

27691847 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691847 is an equidigital number, since it uses as much as digits as its factorization.

27691847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 27691847 is about 5262.3043431561. The cubic root of 27691847 is about 302.5408163852.

The spelling of 27691847 in words is "twenty-seven million, six hundred ninety-one thousand, eight hundred forty-seven".