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How much is 600?

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It's about seven times the number of Keys on a Piano.
In other words, 600 is 6.8 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.15 times that amount.
(Moden layout; A0 to C7)
It's about eight-and-a-half times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.12 times 600.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
The United States Navy maintains a fleet of 72 active submarines. A typical submarine goes to sea with a crew of about 140.
It's about one-tenth the number of Bishops in the Catholic Church.
In other words, 600 is 0.1121 times the count of Bishops in the Catholic Church, and the count of Bishops in the Catholic Church is 8.921 times that amount.
(2015 figures; total Latin and Eastern Church figures; including Pope)
As of 2015, there are 5,352 bishops in the Catholic Church. These bishops supervise a total of 3,127 dioceses, archdioceses, and other administrative regions.
It's about eleven times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.091 times 600.
(2016 figures) (sovereign states recognized by the UN only)
It's about thirteen times the number of Teeth in a Great White Shark's Mouth.
In other words, the count of Teeth in a Great White Shark's Mouth is 0.077 times 600.
(Carcharodon carcharias) (average; including developing rows)
It's about one-fifteenth the number of Blue Whales in the World.
In other words, the count of Blue Whales in the World is 14 times 600.
(Balaenoptera musculus) (2002 estimates)
It's about one-fifteenth the number of Benches in Central Park.
In other words, the count of Benches in Central Park is 10 times 600.
(Manhattan, New York City, New York)