27885989 has 2 divisors, whose sum is σ = 27885990. Its totient is φ = 27885988.

The previous prime is 27885947. The next prime is 27885997. The reversal of 27885989 is 98958872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26697889 + 1188100 = 5167^2 + 1090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27885989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27885919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13942994 + 13942995.

It is an arithmetic number, because the mean of its divisors is an integer number (13942995).

Almost surely, 2^27885989 is an apocalyptic number.

It is an amenable number.

27885989 is a deficient number, since it is larger than the sum of its proper divisors (1).

27885989 is an equidigital number, since it uses as much as digits as its factorization.

27885989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2903040, while the sum is 56.

The square root of 27885989 is about 5280.7186064020. The cubic root of 27885989 is about 303.2461882525.

The spelling of 27885989 in words is "twenty-seven million, eight hundred eighty-five thousand, nine hundred eighty-nine".