27989147 has 16 divisors (see below), whose sum is σ = 30912000. Its totient is φ = 25238304.

The previous prime is 27989077. The next prime is 27989153. The reversal of 27989147 is 74198972.

It is a cyclic number.

It is not a de Polignac number, because 27989147 - 2¹⁰ = 27988123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27989197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43208 + ... + 43850.

It is an arithmetic number, because the mean of its divisors is an integer number (1932000).

Almost surely, 2^27989147 is an apocalyptic number.

27989147 is a deficient number, since it is larger than the sum of its proper divisors (2922853).

27989147 is a wasteful number, since it uses less digits than its factorization.

27989147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770.

The product of its digits is 254016, while the sum is 47.

The square root of 27989147 is about 5290.4770106296. The cubic root of 27989147 is about 303.6196586649.

The spelling of 27989147 in words is "twenty-seven million, nine hundred eighty-nine thousand, one hundred forty-seven".