Multiplicative cakacaka

Ena naba icavacava, na multiplicative cakacaka e artihmetic cakacaka f(n) e dua na integer vinaka ena kena iyau f(1) = 1 kei whenevera b kena e coprime, qai:

$f(ab)=f(a)f(b).$

E dua arithmetic cakacaka f(n) e tukuni me multiplicative vakaoti (se sara multiplicative) kevaka f(1) = 1 and f(ab) = f(a)f(b) taura vei ira kece integer vinaka a ka b, kevaka sara mada ga e sega ni coprime.