27785385 has 12 divisors (see below), whose sum is σ = 48161412. Its totient is φ = 14818848.

The previous prime is 27785377. The next prime is 27785399. The reversal of 27785385 is 58358772.

It can be written as a sum of positive squares in 2 ways, for example, as 19900521 + 7884864 = 4461^2 + 2808^2 .

It is not a de Polignac number, because 27785385 - 2³ = 27785377 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: 617453 = 27785385 / (2 + 7 + 7 + 8 + 5 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 27785385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308682 + ... + 308771.

It is an arithmetic number, because the mean of its divisors is an integer number (4013451).

Almost surely, 2^27785385 is an apocalyptic number.

It is an amenable number.

27785385 is a deficient number, since it is larger than the sum of its proper divisors (20376027).

27785385 is a wasteful number, since it uses less digits than its factorization.

27785385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617464 (or 617461 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 27785385 is about 5271.1844020106. The cubic root of 27785385 is about 302.8810760956.

The spelling of 27785385 in words is "twenty-seven million, seven hundred eighty-five thousand, three hundred eighty-five".