27806210989 has 2 divisors, whose sum is σ = 27806210990. Its totient is φ = 27806210988.

The previous prime is 27806210987. The next prime is 27806211047. The reversal of 27806210989 is 98901260872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27736237764 + 69973225 = 166542^2 + 8365^2 .

It is a cyclic number.

It is not a de Polignac number, because 27806210989 - 2¹ = 27806210987 is a prime.

Together with 27806210987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27806210983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13903105494 + 13903105495.

It is an arithmetic number, because the mean of its divisors is an integer number (13903105495).

Almost surely, 2^27806210989 is an apocalyptic number.

It is an amenable number.

27806210989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27806210989 is an equidigital number, since it uses as much as digits as its factorization.

27806210989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 52.

The spelling of 27806210989 in words is "twenty-seven billion, eight hundred six million, two hundred ten thousand, nine hundred eighty-nine".