27987849 has 40 divisors (see below), whose sum is σ = 44396352. Its totient is φ = 17534880.

The previous prime is 27987809. The next prime is 27987877. The reversal of 27987849 is 94878972.

It is not a de Polignac number, because 27987849 - 2⁷ = 27987721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27987795 and 27987804.

It is not an unprimeable number, because it can be changed into a prime (27987809) 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 39 ways as a sum of consecutive naturals, for example, 154539 + ... + 154719.

Almost surely, 2^27987849 is an apocalyptic number.

It is an amenable number.

27987849 is a deficient number, since it is larger than the sum of its proper divisors (16408503).

27987849 is a wasteful number, since it uses less digits than its factorization.

27987849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 290 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 27987849 is about 5290.3543359590. The cubic root of 27987849 is about 303.6149651265.

The spelling of 27987849 in words is "twenty-seven million, nine hundred eighty-seven thousand, eight hundred forty-nine".