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How much is 4,500?

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It's about 50 times the number of Keys on a Piano
In other words, 4,500 is 51 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.0 times that amount.
(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about 65 times the number of Submarines in the US Navy
In other words, 4,500 is 63 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 0.02 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about 80 times the number of Countries in Africa
In other words, 4,500 is 80 times the count of Countries in Africa, and the count of Countries in Africa is 0.01 times that amount.
(2016 figures) (sovereign states recognized by the UN only)
It's about 95 times the number of Teeth in a Great White Shark's Mouth
In other words, 4,500 is 94 times the count of Teeth in a Great White Shark's Mouth, and the count of Teeth in a Great White Shark's Mouth is 0.01 times that amount.
(Carcharodon carcharias) (average; including developing rows)
A Great White Shark has 48 exposed teeth on their upper and lower jaws. Behind these exposed teeth are developing teeth — up to 300 in about 5 rows. The sharks will continuously lose and replace the exposed teeth throughout their lives.
It's about 150 times the number of Countries in the European Union
In other words, 4,500 is 170 times the count of Countries in the European Union, and the count of Countries in the European Union is 0.006 times that amount.
(a.k.a. EU) (2016 figures)
It's about 300 times the number of Living Kings and Queens
In other words, 4,500 is 300 times the count of Living Kings and Queens, and the count of Living Kings and Queens is 0.003 times that amount.
(2015 figures) (distinct Monarchs)
It's about 500 times the number of Symphonies Composed by Beethoven
In other words, 4,500 is 500 times the count of Symphonies Composed by Beethoven, and the count of Symphonies Composed by Beethoven is 0.00 times that amount.
(a.k.a. Ludwig van Beethoven)