Yes - 123456/2 = 61728
None. Extremely simple proof: To be divisible by 5 the units digit must be 5. But then it would not be divisible by 2.
Yes.
No, it is not divisible by 123456 nor by 10.
Yes, the result is 20,576.
No, 60 is.
It is a 'multiple' of 123,456. The number of multiples is infinite.
123456
192 ways
123456
99876543210
15241383936