68

68 (sixty-eight) is a positive integer following 67 and preceding 69. Its ordinal form is written "sixty-eighth" or 68th.
== Properties ==
* 68 is an .
* 68 is a MathWorld, Happy Number because repeatedly summing the squares digits will lead to 1: 68, 62 + 82 = 100, 12 + 02 + 02 = 1.
== In chess ==
It is also the number of possible knight moves in 4×5 minichess.
== In googology ==
In Greek-based number-naming systems, 68 is associated with prefix "octohexaconta-", and with prefix "octosexaginti-" in Latin systems.
== In TV broadcasting ==
In most of the Old World, the ends at 68 MHz.
== Sources ==
Category:Numbers
Category:Chess
Category:Class 1
Category:Even numbers
Category:Non-powers
Category:Numbers 0-99
Category:Numbers in engineering
Category:Numbers with 1 to 2 digits