Monaco, a sovereign city-state on the French Riviera, is known as a "Billionaires' Playground." The tiny city-state is famous for its lavish wealth, casinos, and glamorous events such as the Monaco Yacht Show and the Monaco Grand Prix.

With an area of just 0.78 square miles and a population of 38,300, Monaco is one of the densest countries in the world.

Here are 15 mind-blowing facts about Monaco, from the number of millionaires who live there to the number of police officers per resident.

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SEE ALSO: What it's like living in Monaco, the glamorous city-state on the French Riviera that's home to a glitzy annual yacht show and where an estimated 1 in 3 people is a millionaire

DON'T MISS: Inside the ultra-luxurious Monaco hotel where celebrities, millionaires, and the yachting elite stay in rooms that cost up to $41,000 per night