If earth stops rotating then the value of g at the equator is increases and becomes equal to the value of at poles. This is because the equatorial bulge will vanish and earth will have uniform radius
$$\begin{gathered} \text{g}\propto \frac{\text{1}}{{\text{r}}^{\text{2}}} \\ {\text{r}}_{\text{E}}={\text{r}}_{\text{P}} \\ \therefore {\text{g}}_{\text{E}}={\text{g}}_{\text{P}} \end{gathered}$$