It's about five times the number of Keys on a Piano.
In other words, 450 is 5.1 times the count of Keys on a Piano, and the count of Keys on a Piano is 0.2 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 six-and-a-half times the number of Submarines in the US Navy.
In other words, the count of Submarines in the US Navy is 0.16 times 450.(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about eight-and-a-half times the number of Countries in Africa.
In other words, the count of Countries in Africa is 0.12 times 450.(2016 figures) (sovereign states recognized by the UN only)
It's about nine-and-a-half 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 0.11 times 450.(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 one-tenth the number of Bishops in the Catholic Church.
In other words, 450 is 0.08408 times the count of Bishops in the Catholic Church, and the count of Bishops in the Catholic Church is 11.89 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 sixteen times the number of Countries in the European Union.
In other words, the count of Countries in the European Union is 0.063 times 450.(a.k.a. EU) (2016 figures)
There are 28 member countries in the European Union, the latest member of which is Croatia. The EU is largely urban, with sixteen cities having a population of one million or more, and 75% of the population living in an urban area.
It's about one-twentieth the number of Blue Whales in the World.
In other words, the count of Blue Whales in the World is 19 times 450.(Balaenoptera musculus) (2002 estimates)