# 45

## 45 is an odd composite number composed of two prime numbers multiplied together.

What does the number 45 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 6 divisors.

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:

### 32 × 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 Forty-five.

### Scientific notation

• Scientific notation: 4.5 × 101

### 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: 1011012
• Base-36: 19

### Squares and roots of 45

• 45 squared (452) is 2025
• 45 cubed (453) 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!