There's no way to give an exact answer as it depends on the jug itself and it's dimensions however you should be able to fit around 38,000 pennies into a 5 gallon jug or 5 gallon bucket.
To get the amount of dollars that 38,000 pennies would be we would be you would go by the figure that 1,000 pennies would equal $10.00 so to figure out how much money would be in 38,000 pennies you would take $10.00 x 38 which is $380.00
So in a 5 gallon jug or 5 gallon bucket you'd have around $380.00 to $400.00 in pennies.
Remember that there are 100 pennies to every dollar.