27805889 has 2 divisors, whose sum is σ = 27805890. Its totient is φ = 27805888.

The previous prime is 27805861. The next prime is 27805891. The reversal of 27805889 is 98850872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22165264 + 5640625 = 4708^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 27805889 - 2⁸ = 27805633 is a prime.

It is a Sophie Germain prime.

Together with 27805891, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27805819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13902944 + 13902945.

It is an arithmetic number, because the mean of its divisors is an integer number (13902945).

Almost surely, 2^27805889 is an apocalyptic number.

It is an amenable number.

27805889 is a deficient number, since it is larger than the sum of its proper divisors (1).

27805889 is an equidigital number, since it uses as much as digits as its factorization.

27805889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 27805889 is about 5273.1289572701. The cubic root of 27805889 is about 302.9555606565.

The spelling of 27805889 in words is "twenty-seven million, eight hundred five thousand, eight hundred eighty-nine".