What number between 30 and 40 has only itself as factors?

The numbers between 30 and 40 only factors are one and themselves, and the prime numbers are 31 and 37.

7days is 168 hours in decimal form it is just 168 there is no decimal form for this because it is like 168.0 and there is no number you are dividing it by for it to be a decimal.hope this