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How much is 690?

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It's about one-tenth the number of Bishops in the Catholic Church.
In other words, 690 is 0.12890 times the count of Bishops in the Catholic Church, and the count of Bishops in the Catholic Church is 7.7580 times that amount.
(2015 figures; total Latin and Eastern Church figures; including Pope)
It's about eight times the number of Keys on a Piano.
In other words, 690 is 7.80 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.130 times that amount.
(Moden layout; A0 to C7)
It's about nine-and-a-half times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.10 times 690.
(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about one-tenth the number of Blue Whales in the World.
In other words, the count of Blue Whales in the World is 12 times 690.
(Balaenoptera musculus) (2002 estimates)
The worldwide population of blue whales (as of 2002) is estimated to be between 5,000 and 12,000. An estimated 378,200 blue whales were killed during the height of whaling in the late nineteenth and early twentieth centures
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 690.
(Manhattan, New York City, New York)
It's about thirteen times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.077 times 690.
(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-fifteenth the number of Written Characters in the Chinese Language.
In other words, 690 is 0.07377 times the count of Written Characters in the Chinese Language, and the count of Written Characters in the Chinese Language is 13.560 times that amount.
(zhōngwén, 中文) (Hànzì, 汉字/漢字; Shuowen Jiezi count; distinct characters)