27687391 has 2 divisors, whose sum is σ = 27687392. Its totient is φ = 27687390.

The previous prime is 27687383. The next prime is 27687449. The reversal of 27687391 is 19378672.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27687391 - 2³ = 27687383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27687301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13843695 + 13843696.

It is an arithmetic number, because the mean of its divisors is an integer number (13843696).

Almost surely, 2^27687391 is an apocalyptic number.

27687391 is a deficient number, since it is larger than the sum of its proper divisors (1).

27687391 is an equidigital number, since it uses as much as digits as its factorization.

27687391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 43.

The square root of 27687391 is about 5261.8809374595. The cubic root of 27687391 is about 302.5245878518.

The spelling of 27687391 in words is "twenty-seven million, six hundred eighty-seven thousand, three hundred ninety-one".