You need at least two numbers to find a GCF. If that's 28, 104 and 132, the GCF is 4.
The GCF is 132.
The GCF of 169 and 104 is 13.
The GCF is 4.
The GCF is 12.
The GCF is 12.
The GCF is 12.
The GCF is 3.
The GCF is 44.
The GCF is 12.
The GCF is 11.
The GCF of 13, 78 and 104 is 13. The GCF of 1378 and 104 is 26.