27708666887 has 18 divisors (see below), whose sum is σ = 30665196072. Its totient is φ = 25017478200.

The previous prime is 27708666857. The next prime is 27708666907. The reversal of 27708666887 is 78866680772.

It is not a de Polignac number, because 27708666887 - 2¹⁰ = 27708665863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27708666827) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23661812 + ... + 23662982.

It is an arithmetic number, because the mean of its divisors is an integer number (1703622004).

Almost surely, 2^27708666887 is an apocalyptic number.

27708666887 is a deficient number, since it is larger than the sum of its proper divisors (2956529185).

27708666887 is an equidigital number, since it uses as much as digits as its factorization.

27708666887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 1349 counting only the distinct ones).

The product of its (nonzero) digits is 75866112, while the sum is 65.

The spelling of 27708666887 in words is "twenty-seven billion, seven hundred eight million, six hundred sixty-six thousand, eight hundred eighty-seven".