68 May 2026

, 68 is the very last two-digit number to appear for the first time.

In restaurant slang, "68" is the opposite of "86" (which means to remove an item from the menu). A "68" means an item is back on the menu or available.

68 is a "happy number," meaning that if you take the sum of the squares of its digits and continue the process, you eventually reach 1. The Last Two-Digit "First" Number: In the digits of , 68 is the very last two-digit number

It is known as the largest number that can be expressed as the sum of two primes in exactly two different ways (

), a regular 68-sided polygon is considered constructible using only a compass and straightedge. 68 in Culture and Daily Life 68 is a "happy number," meaning that if

). Many mathematicians believe it is the last even number to have this exact property before higher numbers begin having three or more pairs. Because of its factorization (

1968 is famously remembered as a landmark year of global social and political turbulence, often referred to simply as "68". Many mathematicians believe it is the last even

On an infinite chessboard, there are 68 distinct squares that are exactly three knight's moves away from any starting square.