27718987 has 2 divisors, whose sum is σ = 27718988. Its totient is φ = 27718986.

The previous prime is 27718969. The next prime is 27719017. The reversal of 27718987 is 78981772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27718987 - 2¹¹ = 27716939 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27718987.

It is not a weakly prime, because it can be changed into another prime (27718907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13859493 + 13859494.

It is an arithmetic number, because the mean of its divisors is an integer number (13859494).

Almost surely, 2^27718987 is an apocalyptic number.

27718987 is a deficient number, since it is larger than the sum of its proper divisors (1).

27718987 is an equidigital number, since it uses as much as digits as its factorization.

27718987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 49.

The square root of 27718987 is about 5264.8824298364. The cubic root of 27718987 is about 302.6396213605.

The spelling of 27718987 in words is "twenty-seven million, seven hundred eighteen thousand, nine hundred eighty-seven".