A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one, which is 479. Also, only one number can be the greatest.
479 and 958 is one possibility.
You can't have the greatest common factor of just one number - for it to be common there needs to be at least 2 numbers.
958 and 1437
The two numbers can be 479 and 958 (479 doubled). 958 only has the factors 479 and 2, so, since 2 does not factor into 479, the common factor remains 479.
479 is a prime number. Numbers having a greatest common factor of 479 are 479 and 958, or any other two or more multiples of 479.
A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
958 and 1437
958 and 1437
Oh, dude, you're hitting me with some math vibes here. So, if the greatest common factor of two numbers is 479 and one is odd while the other is even, and they're not divisible by each other, then the smallest those two numbers could be is 479 and 958. The odd number would be 479 and the even number would be 958. Easy peasy lemon squeezy!
1600 - 958 = 642
958+200 = 1158