27691385 has 8 divisors (see below), whose sum is σ = 35184456. Its totient is φ = 20849920.

The previous prime is 27691369. The next prime is 27691397. The reversal of 27691385 is 58319672.

It can be written as a sum of positive squares in 4 ways, for example, as 3759721 + 23931664 = 1939^2 + 4892^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27691385 - 2⁴ = 27691369 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 162806 + ... + 162975.

It is an arithmetic number, because the mean of its divisors is an integer number (4398057).

Almost surely, 2^27691385 is an apocalyptic number.

It is an amenable number.

27691385 is a deficient number, since it is larger than the sum of its proper divisors (7493071).

27691385 is a wasteful number, since it uses less digits than its factorization.

27691385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325803.

The product of its digits is 90720, while the sum is 41.

The square root of 27691385 is about 5262.2604458540. The cubic root of 27691385 is about 302.5391338848.

It can be divided in two parts, 2769 and 1385, that multiplied together give a triangular number (3835065 = T₂₇₆₉).

The spelling of 27691385 in words is "twenty-seven million, six hundred ninety-one thousand, three hundred eighty-five".