27899989889 has 2 divisors, whose sum is σ = 27899989890. Its totient is φ = 27899989888.

The previous prime is 27899989879. The next prime is 27899989921. The reversal of 27899989889 is 98898999872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19998202225 + 7901787664 = 141415^2 + 88892^2 .

It is a cyclic number.

It is not a de Polignac number, because 27899989889 - 2²⁰ = 27898941313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27899989889.

It is not a weakly prime, because it can be changed into another prime (27899989879) 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, 13949994944 + 13949994945.

It is an arithmetic number, because the mean of its divisors is an integer number (13949994945).

Almost surely, 2^27899989889 is an apocalyptic number.

It is an amenable number.

27899989889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27899989889 is an equidigital number, since it uses as much as digits as its factorization.

27899989889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386105856, while the sum is 86.

The spelling of 27899989889 in words is "twenty-seven billion, eight hundred ninety-nine million, nine hundred eighty-nine thousand, eight hundred eighty-nine".