82,84,86,88,90...
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80 is an even number.
80
There are 40 of them. They are of the form 2*k where k is an integer from 1 to 40.
Oh, isn't that a happy little question? If we take a look between 80 and 85, we find the number 82 nestled right in the middle, like a little bird perched on a branch. It's a peaceful number, just waiting to be noticed and appreciated.
The prime numbers between 70 and 80 are 71, 73, and 79.