27808288889 has 2 divisors, whose sum is σ = 27808288890. Its totient is φ = 27808288888.

The previous prime is 27808288873. The next prime is 27808288891. The reversal of 27808288889 is 98888280872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20078890000 + 7729398889 = 141700^2 + 87917^2 .

It is a cyclic number.

It is not a de Polignac number, because 27808288889 - 2⁴ = 27808288873 is a prime.

Together with 27808288891, 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 (27808288289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13904144444 + 13904144445.

It is an arithmetic number, because the mean of its divisors is an integer number (13904144445).

Almost surely, 2^27808288889 is an apocalyptic number.

It is an amenable number.

27808288889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27808288889 is an equidigital number, since it uses as much as digits as its factorization.

27808288889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 66060288, while the sum is 68.

The spelling of 27808288889 in words is "twenty-seven billion, eight hundred eight million, two hundred eighty-eight thousand, eight hundred eighty-nine".