45
45 is an odd composite number composed of two prime numbers multiplied together.
45 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.
Prime factorization of 45:
3^{2} × 5^{}
(3 × 3 × 5)See below for interesting mathematical facts about the number 45 from the Numbermatics database.
Names of 45
 Cardinal: 45 can be written as Fortyfive.
Scientific notation
 Scientific notation: 4.5 × 10^{1}
Factors of 45
 Number of distinct prime factors ω(n): 2
 Total number of prime factors Ω(n): 3
 Sum of prime factors: 8
Divisors of 45
 Number of divisors d(n): 6
 Complete list of divisors:
 Sum of all divisors σ(n): 78
 Sum of proper divisors (its aliquot sum) s(n): 33
 45 is a deficient number, because the sum of its proper divisors (33) is less than itself. Its deficiency is 12
Bases of 45
 Binary: 101101_{2}
 Hexadecimal: 0x2D
 Base36: 19
Squares and roots of 45
 45 squared (45^{2}) is 2025
 45 cubed (45^{3}) is 91125

The
square root of 45 is 6.7082039325 
The
cube root of 45 is 3.5568933047
Scales and comparisons
How big is 45? A cube with a volume of 45 cubic inches would be around 0.3 feet tall.
Recreational maths with 45
 45 backwards is 54
 45 is a
Harshad number .  The number of decimal digits it has is: 2
 The sum of 45's digits is 9
 More coming soon!
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The information we have on file for 45 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
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