27911691 has 6 divisors (see below), whose sum is σ = 40316900. Its totient is φ = 18607788.

The previous prime is 27911669. The next prime is 27911701. The reversal of 27911691 is 19611972.

It is not a de Polignac number, because 27911691 - 2¹⁵ = 27878923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27911621) 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 5 ways as a sum of consecutive naturals, for example, 1550641 + ... + 1550658.

Almost surely, 2^27911691 is an apocalyptic number.

27911691 is a deficient number, since it is larger than the sum of its proper divisors (12405209).

27911691 is a wasteful number, since it uses less digits than its factorization.

27911691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3101305 (or 3101302 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 27911691 is about 5283.1516162230. The cubic root of 27911691 is about 303.3393251107.

The spelling of 27911691 in words is "twenty-seven million, nine hundred eleven thousand, six hundred ninety-one".