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How much is 510?

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It's about six times the number of Keys on a Piano.
In other words, 510 is 5.80 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.170 times that amount.
(Moden layout; A0 to C7)
It's about seven times the number of Submarines in the US Navy.
In other words, 510 is 7.10 times the count of Submarines in the US Navy, and the count of Submarines in the US Navy is 0.140 times that amount.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about nine-and-a-half times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.110 times 510.
(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 54 sovereign countries recognized by the United Nations as of 2016. It is the second-most populous continent in the world, with 1.1 billion inhabitants.
It's about one-tenth the number of Bishops in the Catholic Church.
In other words, 510 is 0.09529 times the count of Bishops in the Catholic Church, and the count of Bishops in the Catholic Church is 10.490 times that amount.
(2015 figures; total Latin and Eastern Church figures; including Pope)
It's about eleven 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 0.091 times 510.
(Carcharodon carcharias) (average; including developing rows)
It's about one-fifteenth the number of Benches in Central Park.
In other words, the count of Benches in Central Park is 20 times 510.
(Manhattan, New York City, New York)
Central Park — the 843-acre park located in the heart of New York City — contains about 9,000 park benches. The park is one of the most famous in the world and entertains over 35 million visitors each year.
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 17 times 510.
(Balaenoptera musculus) (2002 estimates)