27745891 has 2 divisors, whose sum is σ = 27745892. Its totient is φ = 27745890.

The previous prime is 27745847. The next prime is 27745901. The reversal of 27745891 is 19854772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27745891 - 2⁷ = 27745763 is a prime.

It is not a weakly prime, because it can be changed into another prime (27745391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13872945 + 13872946.

It is an arithmetic number, because the mean of its divisors is an integer number (13872946).

Almost surely, 2^27745891 is an apocalyptic number.

27745891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27745891 is an equidigital number, since it uses as much as digits as its factorization.

27745891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141120, while the sum is 43.

The square root of 27745891 is about 5267.4368529675. The cubic root of 27745891 is about 302.7375035272.

The spelling of 27745891 in words is "twenty-seven million, seven hundred forty-five thousand, eight hundred ninety-one".