# 2645

## 2,645 is an odd composite number composed of two prime numbers multiplied together.

What does the number 2645 look like?

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

2645 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 2645:

### 5 × 232

(5 × 23 × 23)

See below for interesting mathematical facts about the number 2645 from the Numbermatics database.

### Names of 2645

• Cardinal: 2645 can be written as Two thousand, six hundred forty-five.

### Scientific notation

• Scientific notation: 2.645 × 103

### Factors of 2645

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 28

### Divisors of 2645

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 3318
• Sum of proper divisors (its aliquot sum) s(n): 673
• 2645 is a deficient number, because the sum of its proper divisors (673) is less than itself. Its deficiency is 1972

### Bases of 2645

• Binary: 1010010101012
• Base-36: 21H

### Squares and roots of 2645

• 2645 squared (26452) is 6996025
• 2645 cubed (26453) is 18504486125
• The square root of 2645 is 51.4295634825
• The cube root of 2645 is 13.8295662393

### Scales and comparisons

How big is 2645?
• 2,645 seconds is equal to 44 minutes, 5 seconds.
• To count from 1 to 2,645 would take you about forty-four minutes.

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 2645 cubic inches would be around 1.2 feet tall.

### Recreational maths with 2645

• 2645 backwards is 5462
• The number of decimal digits it has is: 4
• The sum of 2645's digits is 17
• More coming soon!