27989747 has 2 divisors, whose sum is σ = 27989748. Its totient is φ = 27989746.

The previous prime is 27989737. The next prime is 27989771. The reversal of 27989747 is 74798972.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27989747 - 2⁸ = 27989491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27989737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13994873 + 13994874.

It is an arithmetic number, because the mean of its divisors is an integer number (13994874).

Almost surely, 2^27989747 is an apocalyptic number.

27989747 is a deficient number, since it is larger than the sum of its proper divisors (1).

27989747 is an equidigital number, since it uses as much as digits as its factorization.

27989747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 53.

The square root of 27989747 is about 5290.5337159875. The cubic root of 27989747 is about 303.6218282022.

The spelling of 27989747 in words is "twenty-seven million, nine hundred eighty-nine thousand, seven hundred forty-seven".