Answer :

[tex]32|2\\16|2\\.\ 8|2\\.\ 4|2\\.\ 2|2\\.\ 1|\\32=\fbox2\cdot\fbox2\cdot2\cdot2\cdot2\\\\52|2\\26|2\\13|13\\.\ 1|\\52=\fbox2\cdot\fbox2\cdot13\\\\GCF(32;\ 52)=\fbox2\cdot\fbox2=\boxed{\boxed{4}}[/tex]
it is 4, 1, and by its self like 32 and 52.