27685672871 has 4 divisors (see below), whose sum is σ = 27738609672. Its totient is φ = 27632736072.

The previous prime is 27685672849. The next prime is 27685672909. The reversal of 27685672871 is 17827658672.

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 27685672871 - 2²² = 27681478567 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27685672871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27685672841) 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, 26467616 + ... + 26468661.

It is an arithmetic number, because the mean of its divisors is an integer number (6934652418).

Almost surely, 2^27685672871 is an apocalyptic number.

27685672871 is a deficient number, since it is larger than the sum of its proper divisors (52936801).

27685672871 is an equidigital number, since it uses as much as digits as its factorization.

27685672871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52936800.

The product of its digits is 15805440, while the sum is 59.

The spelling of 27685672871 in words is "twenty-seven billion, six hundred eighty-five million, six hundred seventy-two thousand, eight hundred seventy-one".