27927881 has 4 divisors (see below), whose sum is σ = 28023492. Its totient is φ = 27832272.

The previous prime is 27927857. The next prime is 27927901. The reversal of 27927881 is 18872972.

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 26214400 + 1713481 = 5120^2 + 1309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27927881 is a prime.

It is a super-2 number, since 2×27927881² = 1559933074300322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27923881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47366 + ... + 47951.

It is an arithmetic number, because the mean of its divisors is an integer number (7005873).

Almost surely, 2^27927881 is an apocalyptic number.

It is an amenable number.

27927881 is a deficient number, since it is larger than the sum of its proper divisors (95611).

27927881 is an equidigital number, since it uses as much as digits as its factorization.

27927881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95610.

The product of its digits is 112896, while the sum is 44.

The square root of 27927881 is about 5284.6836234537. The cubic root of 27927881 is about 303.3979637942.

The spelling of 27927881 in words is "twenty-seven million, nine hundred twenty-seven thousand, eight hundred eighty-one".