For g β \(\Z\), let \(\bar{g}\) β \(\Z_8\) denote the residue class of g modulo 8. Consider the group \(\Z^Γ_8\) = {\(\bar{x}\) β \(\Z_8\) : 1 ≤ x ≤ 7, gcd(x, 8) = 1} with respect to multiplication modulo 8. The number of group isomorphisms from \(\Z^Γ_8\) onto itself is equal to ________