It is 28, of course!
The sum is 297.
Their sum is 56.
28
The sum of their squares is 10.
The sum is 28+38 = 66
It is 28, of course!
sum=360
The sum is 297.
Their sum is 56.
That sum would be 76.
The prime factors of 28 are 2 and 7. Their sum is 9.
It is: 28+46 = 74
32 + 28 = 60
28+9=37
The sum of 19 and 9 is 28.
The sum is: 432+28 = 460