36
36 is a perfect square (6²) and also a triangular number.
Where 36 fits
Why 36 is special
36 is one of the few numbers under 100 that is both a perfect square and triangular.
Factors & digit properties
- Divisors (9)
- 1, 2, 3, 4, 6, 9, 12, 18, 36
- Prime factorisation
- 2^2 × 3^2
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 36
- Binary
- 100100
- Octal
- 44
- Hexadecimal
- 24
- Roman numeral
- XXXVI
- Scientific notation
- 3.600 × 10^1
Other mathematical patterns
- Triangular number
- Abundant number
- Powerful number
- Highly composite number
- Harshad (Niven) number
Related numbers & connections
36 is a factor of 72 (36 × 2 = 72).
View 72 →36 is the atomic number of krypton.
Mathematically related
- is a factor of72
why?
Strength 0.50, confidence "high".
Scientific association
- has scientific association withKrypton (chemical element)
why?
Strength 0.50, confidence "high".
Science
36 is the atomic number of krypton, a noble gas used in some specialised lighting.
DocumentedScience36 is the atomic number of krypton, a noble gas used in some specialised lighting.
DocumentedScience
Common questions
Is 36 a prime number?
No, 36 is not prime.
What are the factors of 36?
The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, 36.
What is 36 in Roman numerals?
36 in Roman numerals is XXXVI.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026