27605891 has 2 divisors, whose sum is σ = 27605892. Its totient is φ = 27605890.

The previous prime is 27605887. The next prime is 27605927. The reversal of 27605891 is 19850672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27605891 - 2² = 27605887 is a prime.

It is not a weakly prime, because it can be changed into another prime (27605821) 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 as a sum of consecutive naturals, namely, 13802945 + 13802946.

It is an arithmetic number, because the mean of its divisors is an integer number (13802946).

Almost surely, 2^27605891 is an apocalyptic number.

27605891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27605891 is an equidigital number, since it uses as much as digits as its factorization.

27605891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 27605891 is about 5254.1308510542. The cubic root of 27605891 is about 302.2274611971.

The spelling of 27605891 in words is "twenty-seven million, six hundred five thousand, eight hundred ninety-one".