27897887 has 2 divisors, whose sum is σ = 27897888. Its totient is φ = 27897886.

The previous prime is 27897839. The next prime is 27897907. The reversal of 27897887 is 78879872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27897887 - 2⁸ = 27897631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27891887) 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, 13948943 + 13948944.

It is an arithmetic number, because the mean of its divisors is an integer number (13948944).

Almost surely, 2^27897887 is an apocalyptic number.

27897887 is a deficient number, since it is larger than the sum of its proper divisors (1).

27897887 is an equidigital number, since it uses as much as digits as its factorization.

27897887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3161088, while the sum is 56.

The square root of 27897887 is about 5281.8450374845. The cubic root of 27897887 is about 303.2893103873.

The spelling of 27897887 in words is "twenty-seven million, eight hundred ninety-seven thousand, eight hundred eighty-seven".