Using those 4 digits 6451 is the largest odd number you can make.
the largest odd number is 9
The largest 3-digit odd number is 999.
The question does not make any sense at all because72 is not an odd number72 is not the largest factor of 720
There is no such thing as a largest number - odd or even - because numbers go on for ever.
The largest odd number that can be made with those digits is 9407 .
The number is 9875.