26 (number)
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26 is a natural number that falls between consecutive integers. It comes after 25 and before 27. In the decimal numeral system it consists of two digits: 2 in the tens place and 6 in the ones place.
26 is an even number because it is divisible by 2. It is also a composite number, meaning it has divisors other than 1 and itself. Its divisors are 1, 2, 13, and 26; its prime factorization is 2 × 13.
Mathematical properties
The sum of its proper divisors (1 + 2 + 13) is 16, which is less than 26. For this reason 26 belongs to the class of numbers known as deficient. In binary notation, 26 is written as 11010.
One distinctive property of 26 is that it falls between two consecutive perfect powers: 25 is a perfect square (5 × 5), while 27 is a perfect cube (3 × 3 × 3). Thus 26 is described as a number lying between a consecutive perfect square and perfect cube.
General uses
26 appears in various counting systems. For example, the English alphabet contains 26 letters. It is also used as a marking system for different items, such as page numbers, years, or cards.
Notation and writing
In Roman numerals, 26 is written as 'XXVI'. Many languages express this number as a compound term (for example, 'twenty-six' in English). In lists, it may sometimes be marked as '26)' as a reference symbol.