27708267871 has 4 divisors (see below), whose sum is σ = 28231065432. Its totient is φ = 27185470312.

The previous prime is 27708267869. The next prime is 27708267919. The reversal of 27708267871 is 17876280772.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27708267871 - 2¹ = 27708267869 is a prime.

It is a super-2 number, since 2×27708267871² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27708267841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 261398701 + ... + 261398806.

It is an arithmetic number, because the mean of its divisors is an integer number (7057766358).

Almost surely, 2^27708267871 is an apocalyptic number.

27708267871 is a deficient number, since it is larger than the sum of its proper divisors (522797561).

27708267871 is an equidigital number, since it uses as much as digits as its factorization.

27708267871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522797560.

The product of its (nonzero) digits is 3687936, while the sum is 55.

The spelling of 27708267871 in words is "twenty-seven billion, seven hundred eight million, two hundred sixty-seven thousand, eight hundred seventy-one".