Totient Function of a Decimal Number

[nimble hedge]

I need to apply a eulers totient function to a non-whole number, how would you do this?

[delicate rose]

!original

[heady mural]

Please show the original problem, exactly as it was stated to you, with the entire original context. A picture or screenshot is best. If the original problem is not in English, then post it anyway! The additional context might still be helpful. Do your best to provide a translation.