27688387 has 2 divisors, whose sum is σ = 27688388. Its totient is φ = 27688386.

The previous prime is 27688373. The next prime is 27688391. The reversal of 27688387 is 78388672.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27688387 - 2¹¹ = 27686339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27688387.

It is not a weakly prime, because it can be changed into another prime (27658387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13844193 + 13844194.

It is an arithmetic number, because the mean of its divisors is an integer number (13844194).

Almost surely, 2^27688387 is an apocalyptic number.

27688387 is a deficient number, since it is larger than the sum of its proper divisors (1).

27688387 is an equidigital number, since it uses as much as digits as its factorization.

27688387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 49.

The square root of 27688387 is about 5261.9755795709. The cubic root of 27688387 is about 302.5282153861.

The spelling of 27688387 in words is "twenty-seven million, six hundred eighty-eight thousand, three hundred eighty-seven".