ifactor(Ans) does not work

[retoa]

Hello !

I try to do a factorisation on the result of a previous calculation.
Example: I calculate 78*9 and then try to factorise the result with ifactor.
I receive an error message:
"ifactor(Ans) Error: Bad Argument Value"

See attachment.

Same error both on emulator and real Prime.

Does anyone else have the same problem?
Thank you for the help

Reto