It's a bunch.
Throw in real estate, mineral deposits, oil bearing property, and we probably don't really have a net national debt.
BTW, you can't eat gold, and when the going gets real, real, real tough it's better to have an attic full of tulip bulbs than just about anything else.
And you find people still laughing about the Late Medieval Tulip Bubble!
You cannot eat gold, but you sure can buy food with it.