26

A Rubik's cube can be solved in 26 moves or less 

26 is the number of bones in the foot and ankle

In the numerical alphabet in Hebrew, 26 is the sum of the letters in God's name

26 is the only number between a square number and a cubed number

Michigan was the 26th state

26 is the number of miles run in a marathon (rounded to the nearest whole number)

A rhombicuboctahedron has 26 sides

26 is the age which men can no longer be drafted into the US army

There were 26 cases to open in Deal or No Deal

26 is the name of an Australian Rock band

The square of the number 26 is a palindrome, (26^2=676)

26 is the atomic number of iron

Z is the 26th letter in the alphabet 

26 is the number of new episodes in television series each year in the US

In a standard card deck, there are 26 black cards and 26 red cards

 26 is the number of states President Obama won the popular vote in during the 2012 election

A Brave New World is set in the 26th century 

26 is how old Joe DiMaggio was when he set record for hitting in 56 consecutive games

Teddy Roosevelt was the 26th president of the United States

26 is the number of leaves on a Mango Spray Plant

Albert Einstein was 26 when he published 5 papers, one outlined the famous E=mc^2

26 is the thirteenth even number and 13+13 = 26

There were 26 events in the 2012 Summer Olympics

26 km/h is the average hopping speed of an adult kangaroo

NASA's Expedition 26, took off in 2011 

26 is the number of years I've been alive

26 awesome years around the sun. Bring it on 27, bring it on.