27886721605 has 16 divisors (see below), whose sum is σ = 33931836864. Its totient is φ = 21997699200.

The previous prime is 27886721567. The next prime is 27886721651. The reversal of 27886721605 is 50612768872.

It is not a de Polignac number, because 27886721605 - 2¹⁷ = 27886590533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1689402 + ... + 1705828.

It is an arithmetic number, because the mean of its divisors is an integer number (2120739804).

Almost surely, 2^27886721605 is an apocalyptic number.

It is an amenable number.

27886721605 is a deficient number, since it is larger than the sum of its proper divisors (6045115259).

27886721605 is a wasteful number, since it uses less digits than its factorization.

27886721605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21156.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 27886721605 in words is "twenty-seven billion, eight hundred eighty-six million, seven hundred twenty-one thousand, six hundred five".