27808288891 has 2 divisors, whose sum is σ = 27808288892. Its totient is φ = 27808288890.

The previous prime is 27808288889. The next prime is 27808288933. The reversal of 27808288891 is 19888280872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27808288891 - 2¹ = 27808288889 is a prime.

Together with 27808288889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27808288841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13904144445 + 13904144446.

It is an arithmetic number, because the mean of its divisors is an integer number (13904144446).

Almost surely, 2^27808288891 is an apocalyptic number.

27808288891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27808288891 is an equidigital number, since it uses as much as digits as its factorization.

27808288891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8257536, while the sum is 61.

The spelling of 27808288891 in words is "twenty-seven billion, eight hundred eight million, two hundred eighty-eight thousand, eight hundred ninety-one".