27886868691 has 16 divisors (see below), whose sum is σ = 40600086528. Its totient is φ = 16885562400.

The previous prime is 27886868671. The next prime is 27886868717. The reversal of 27886868691 is 19686868872.

It is not a de Polignac number, because 27886868691 - 2¹⁰ = 27886867667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27886868671) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352840 + ... + 424581.

It is an arithmetic number, because the mean of its divisors is an integer number (2537505408).

Almost surely, 2^27886868691 is an apocalyptic number.

27886868691 is a deficient number, since it is larger than the sum of its proper divisors (12713217837).

27886868691 is a wasteful number, since it uses less digits than its factorization.

27886868691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778522.

The product of its digits is 111476736, while the sum is 69.

The spelling of 27886868691 in words is "twenty-seven billion, eight hundred eighty-six million, eight hundred sixty-eight thousand, six hundred ninety-one".