A page of the Numeropedia - the Special Encyclopedia of Numbers
[Biology] The number of teeth each people has in the lifetime, including 20 “baby teeth” or “milk teeth” which are deciduous and 32 teeth in an adult full set of teeth.
[Calendar] The number of weeks (plus 1 or 2 days) in a calendar year.
The maximum number of complete (full) weeks in a calendar year.
The minimum number of any weekdays in a calendar year.
[Chemistry] The atomic number of Tellurium (Te).
[Game] The number of letters (and spaces) available on the current version puzzle-board of the “Wheel of Fortune” TV show: 12 each on the top row and the bottom row and 14 each on the middle 2 rows.
[Math.] An untouchable number. The sequence of the firstuntouchable numbers is: 2, 5, 52, 88, 96, 120…
[Math.] 524 = 7,311,616 = (7+31+1+6+1+6)4.
[Money] A MasterCard credit card number starts with either 2 digits 51, 52, 53, 54 or 55.
[Music] The number of white keys of a modern piano (together with 36 black keys).
[Phone] International telephone dialing code for Mexico.
[Sport] The loft angle of iron golf clubs is increased by 4o from the vertical, from 2-iron to 9-iron; for pitching wedge is 52o and sand wedge 58o.
2-iron: 18o 3-iron: 22o 4-iron: 26o 5-iron: 30o
6-iron: 34o 7-iron: 38o 8-iron: 42o 9-iron: 46o.
[World] The ISO country code for Barbados is 052 (ISO-3166)
[Measure] The duration of a micro-century (by currently-used Gregorian calendar): 52m 35.6952s. By Julian calendar, it is 52m 35.76s. It is about the length of a standard lecture 50-60 minutes.
[Science] The bohr radius is the smallest possible orbit for the electron in the Hydrogen atom: 52.9×10–12m or 52.9 picometers = 0.529 Ångström.