27555681 has 8 divisors (see below), whose sum is σ = 38674720. Its totient is φ = 17403552.

The previous prime is 27555673. The next prime is 27555709. The reversal of 27555681 is 18655572.

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

It is not a de Polignac number, because 27555681 - 2³ = 27555673 is a prime.

It is a super-2 number, since 2×27555681² = 1518631110747522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27555631) 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 7 ways as a sum of consecutive naturals, for example, 241660 + ... + 241773.

It is an arithmetic number, because the mean of its divisors is an integer number (4834340).

Almost surely, 2^27555681 is an apocalyptic number.

It is an amenable number.

27555681 is a deficient number, since it is larger than the sum of its proper divisors (11119039).

27555681 is a wasteful number, since it uses less digits than its factorization.

27555681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483455.

The product of its digits is 84000, while the sum is 39.

The square root of 27555681 is about 5249.3505312562. The cubic root of 27555681 is about 302.0441180813.

The spelling of 27555681 in words is "twenty-seven million, five hundred fifty-five thousand, six hundred eighty-one".