36 is both the square of six and a triangular number, making it a square triangular number. It is the smallest square triangular number other than one, and it is also the only triangular number other than one whose square root is also a triangular number. It is also a circular number – a square number that ends with the same integer by itself. It is the smallest number n with exactly eight solutions to the equation φ = n. Being the smallest number with exactly nine divisors, 36 is a highly composite number. Adding up some subsets of its divisors gives 36, hence 36 is a semiperfect number. This number is the sum of a twin prime pair, the sum of the cubes of the first three positive integers, and also the product of the squares of the first three positive integers. 36 is the number of degrees in the interior angle of each tip of a regular pentagram. The thirty-six officers problem is a mathematical puzzle. The number of possible outcomes in the roll of two distinct dice. 36 is the largest numeric base that some computer systems support because it exhausts the numerals, 0-9, and the letters, A-Z. See Base 36. The truncated cube and the truncated octahedron are Archimedean solids with 36 edges. The number of domino tilings of a 4×4 checkerboard is 36. Since it is possible to find sequences of 36 consecutive integers such that each inner member shares a factor with either the first or the last member, 36 is an Erdős–Woods number. The sum of the integers from 1 to 36 is 666.
Measurements
The number of inches in a yard.
In the UK, a standard beer barrel is 36 UK gallons, about 163.7 litres.
36 is the number of characters required to store the display name of a UUID or GUID.
In religion
Jewish tradition holds that the number 36 has had special significance since the beginning of time: According to the Midrash, the light created by God on the first day of creation shone for exactly 36 hours; it was replaced by the light of the Sun that was created on the Fourth Day. The Torah commands 36 times to love, respect and protect the stranger. Furthermore, in every generation there are 36 righteous people in whose merit the world continues to exist. In the modern celebration of Hanukkah, 36 candles are kindled in the menorah over the eight days of that holiday.
In one Māori legend, concerning the creation of mankind by the god Tāne, 36 gods took active part in assembling the various parts of the first human before Tāne breathed life into her.
In Shaivism, The 36 tattvas describe the Absolute, its internal aspects and the creation including living beings, down to the physical reality.
In Egyptian religion, the 36 decans are a series of gods presiding over the degrees of the zodiac and the fixed stars
