140
9991
1234567
If the 2 digit number is a multiple of both 5 and 7 then it is a multiple of (5 x 7) which equals 35. The only even 2 digit number which is a multiple of 35 is, 2 x 35 = 70
7 is.
64
It is: 70
There are none but the smallest 3 digit number is 161
As a product of its oprime factors: 2*5*7 = 70
140
1050.
2, 3, 5 and 7.
9991
The highest four digit number with 13 and 7 as common factors is 9919, which is equal to 13 x 763 and 7 x 1417.
56
22
1234567