27556681 has 4 divisors (see below), whose sum is σ = 27567252. Its totient is φ = 27546112.

The previous prime is 27556667. The next prime is 27556693. The reversal of 27556681 is 18665572.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 25918281 + 1638400 = 5091^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 27556681 - 2¹¹ = 27554633 is a prime.

It is a super-2 number, since 2×27556681² = 1518741335471522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27556621) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1725 + ... + 7621.

It is an arithmetic number, because the mean of its divisors is an integer number (6891813).

Almost surely, 2^27556681 is an apocalyptic number.

It is an amenable number.

27556681 is a deficient number, since it is larger than the sum of its proper divisors (10571).

27556681 is an equidigital number, since it uses as much as digits as its factorization.

27556681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10570.

The product of its digits is 100800, while the sum is 40.

The square root of 27556681 is about 5249.4457802705. The cubic root of 27556681 is about 302.0477717800.

The spelling of 27556681 in words is "twenty-seven million, five hundred fifty-six thousand, six hundred eighty-one".