633,600 pennies
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Neither is. Density only depends on the substance, not on how much of it there is.
10,000 i guess
One mile is 1609344 mm. A US nickel is 1.95 mm thick, so a mile-high stack would contain 1609344 / 1.95 = 825,305 coins, rounded to the next-highest whole number. Each nickel is worth 5 cents so the stack's value would be 825305 * 5 = 4126525 cents, or $41,265.25
A penny weighs approximately 2.5 grams. There are 5,280 feet in a mile, so there are 5,280 * 12 = 63,360 inches in a mile. Since pennies are 0.75 inches in diameter, you would need (63,360 / 0.75) = 84,480 pennies to make a mile. Therefore, a mile of pennies would weigh approximately 211,200 grams or 466 pounds.
4000000 pennies is exactly 4000000 pennies.