27866385 has 12 divisors (see below), whose sum is σ = 48301812. Its totient is φ = 14862048.

The previous prime is 27866359. The next prime is 27866387. The reversal of 27866385 is 58366872.

27866385 is a `hidden beast` number, since 2 + 7 + 8 + 6 + 638 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11512449 + 16353936 = 3393^2 + 4044^2 .

It is not a de Polignac number, because 27866385 - 2⁵ = 27866353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 619253 = 27866385 / (2 + 7 + 8 + 6 + 6 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 27866385.

It is not an unprimeable number, because it can be changed into a prime (27866387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309582 + ... + 309671.

It is an arithmetic number, because the mean of its divisors is an integer number (4025151).

Almost surely, 2^27866385 is an apocalyptic number.

It is an amenable number.

27866385 is a deficient number, since it is larger than the sum of its proper divisors (20435427).

27866385 is a wasteful number, since it uses less digits than its factorization.

27866385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619264 (or 619261 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 27866385 is about 5278.8620932925. The cubic root of 27866385 is about 303.1751103609.

The spelling of 27866385 in words is "twenty-seven million, eight hundred sixty-six thousand, three hundred eighty-five".