Arithmetic functions determine all natural numbers "n" for which ϕ (n)=28

Toneeeu

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Nov 24, 2021
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Hello people!
First and in advance sorry for the bad english,
I am trying to study for the exam and im stuck for the hours trying to get this done.. im just lost on this part ..any help would be appreciated! And i would be thankful sooo so much! Its 2:47 AM And im losing my mind....
How did they get that
A€(1,2,4)
B€(1,2)
C€(1,4)
D€(1,28)
Please help sorry for the bad english
 

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