27687672877 has 4 divisors (see below), whose sum is σ = 27690054876. Its totient is φ = 27685290880.

The previous prime is 27687672839. The next prime is 27687672959. The reversal of 27687672877 is 77827678672.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21912584841 + 5775088036 = 148029^2 + 75994^2 .

It is a cyclic number.

It is not a de Polignac number, because 27687672877 - 2¹⁹ = 27687148589 is a prime.

It is a super-2 number, since 2×27687672877² (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 (27687670877) 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, 1173478 + ... + 1196839.

It is an arithmetic number, because the mean of its divisors is an integer number (6922513719).

Almost surely, 2^27687672877 is an apocalyptic number.

It is an amenable number.

27687672877 is a deficient number, since it is larger than the sum of its proper divisors (2381999).

27687672877 is a wasteful number, since it uses less digits than its factorization.

27687672877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381998.

The product of its digits is 154893312, while the sum is 67.

The spelling of 27687672877 in words is "twenty-seven billion, six hundred eighty-seven million, six hundred seventy-two thousand, eight hundred seventy-seven".