27868681 has 4 divisors (see below), whose sum is σ = 28829700. Its totient is φ = 26907664.

The previous prime is 27868679. The next prime is 27868703. The reversal of 27868681 is 18686872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12187081 + 15681600 = 3491^2 + 3960^2 .

It is a cyclic number.

It is not a de Polignac number, because 27868681 - 2¹ = 27868679 is a prime.

It is a super-2 number, since 2×27868681² = 1553326761359522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27860681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480466 + ... + 480523.

It is an arithmetic number, because the mean of its divisors is an integer number (7207425).

Almost surely, 2^27868681 is an apocalyptic number.

It is an amenable number.

27868681 is a deficient number, since it is larger than the sum of its proper divisors (961019).

27868681 is an equidigital number, since it uses as much as digits as its factorization.

27868681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961018.

The product of its digits is 258048, while the sum is 46.

The square root of 27868681 is about 5279.0795599233. The cubic root of 27868681 is about 303.1834366525.

The spelling of 27868681 in words is "twenty-seven million, eight hundred sixty-eight thousand, six hundred eighty-one".