It's about six times the number of Keys on a Piano.
In other words, 540 is 6.10 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.160 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 seven-and-a-half times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.130 times 540.(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about one-tenth the number of Bishops in the Catholic Church.
In other words, 540 is 0.10090 times the count of Bishops in the Catholic Church, and the count of Bishops in the Catholic Church is 9.9110 times that amount.(2015 figures; total Latin and Eastern Church figures; including Pope)
It's about ten times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.10 times 540.(2016 figures) (sovereign states recognized by the UN only)
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 540.(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 16 times 540.(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 20 times 540.(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.