27646891 has 2 divisors, whose sum is σ = 27646892. Its totient is φ = 27646890.

The previous prime is 27646873. The next prime is 27646907. The reversal of 27646891 is 19864672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27646891 - 2⁹ = 27646379 is a prime.

It is not a weakly prime, because it can be changed into another prime (27646841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13823445 + 13823446.

It is an arithmetic number, because the mean of its divisors is an integer number (13823446).

Almost surely, 2^27646891 is an apocalyptic number.

27646891 is a deficient number, since it is larger than the sum of its proper divisors (1).

27646891 is an equidigital number, since it uses as much as digits as its factorization.

27646891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 27646891 is about 5258.0310953816. The cubic root of 27646891 is about 302.3770089449.

The spelling of 27646891 in words is "twenty-seven million, six hundred forty-six thousand, eight hundred ninety-one".