27986645 has 16 divisors (see below), whose sum is σ = 35023872. Its totient is φ = 21444480.

The previous prime is 27986551. The next prime is 27986671. The reversal of 27986645 is 54668972.

It is not a de Polignac number, because 27986645 - 2⁸ = 27986389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27986645.

It is a congruent number.

It is an unprimeable number.

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, 15089 + ... + 16841.

It is an arithmetic number, because the mean of its divisors is an integer number (2188992).

Almost surely, 2^27986645 is an apocalyptic number.

It is an amenable number.

27986645 is a deficient number, since it is larger than the sum of its proper divisors (7037227).

27986645 is a wasteful number, since it uses less digits than its factorization.

27986645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892.

The product of its digits is 725760, while the sum is 47.

The square root of 27986645 is about 5290.2405427353. The cubic root of 27986645 is about 303.6106113602.

The spelling of 27986645 in words is "twenty-seven million, nine hundred eighty-six thousand, six hundred forty-five".