6887

6887 is a natural number that comes after 6886 and before 6888. In mathematics, it is a composite number and, more specifically, a semiprime because it can be written as the product of two primes: 71 and 97. Consequently its positive divisors are 1, 71, 97, and 6887, and its totient φ(6887) equals (71−1)(97−1) = 70×96 = 6720. The number is odd and not divisible by 3 or 5, and its sum of digits is 29.

6887 is congruent to 3 modulo 4, since 71 ≡ 3 (mod 4) and 97 ≡ 1 (mod 4). As a result, 6887 cannot be expressed as a sum of two perfect squares. In binary, it is represented as 1101011100111.

As a natural number with two distinct prime factors, 6887 is squarefree and has exactly four divisors. In the study of number theory, semiprimes such as 6887 are of interest for their simple structure and their role in various algorithms and cryptographic considerations, though 6887 itself is far too small for any cryptographic use.