27985563 has 12 divisors (see below), whose sum is σ = 40617928. Its totient is φ = 18567360.

The previous prime is 27985547. The next prime is 27985571. The reversal of 27985563 is 36558972.

It is a happy number.

27985563 is a `hidden beast` number, since 2 + 7 + 9 + 85 + 563 = 666.

It is not a de Polignac number, because 27985563 - 2⁴ = 27985547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27985523) 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 11 ways as a sum of consecutive naturals, for example, 5470 + ... + 9267.

Almost surely, 2^27985563 is an apocalyptic number.

27985563 is a deficient number, since it is larger than the sum of its proper divisors (12632365).

27985563 is a wasteful number, since it uses less digits than its factorization.

27985563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14954 (or 14951 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 27985563 is about 5290.1382779659. The cubic root of 27985563 is about 303.6066986498.

The spelling of 27985563 in words is "twenty-seven million, nine hundred eighty-five thousand, five hundred sixty-three".