26 (number)

26 is the natural number following 25 and preceding 27.

Mathematics

• 26 is an even number.
• 26 is a composite number, its proper divisors being 1, 2, 13.
• 26 is a semiprime number as it is the product of two distinct prime numbers (2 and 13).
• 26 is a deficient number, as the sum of its proper divisors (16) is less than itself.
• 26 is the smallest number that is not a prime and is one more than a square (5² + 1). Such numbers are called almost squares.
• 26 is a centered heptagonal number.
• 26 is a palindromic number in bases 5 (101) and 12 (22).
• 26 is the atomic number of iron (Fe).
• There are 26 different chiral types of complete graphs with 7 vertices.

In Other Fields

• There are 26 letters in the ISO basic Latin alphabet. This is a common alphabet used in many languages.
• Traditionally, the game of cribbage awards two points for a hand that totals 26.
• The book of Acts in the New Testament of the Bible has 26 chapters.
• The number of cantons in Switzerland.
• Route 66 is a historic highway in the United States.