# 1280

## 1,280 is an even composite number composed of two prime numbers multiplied together.

What does the number 1280 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 18 divisors.

1280 is an even composite number. It is composed of two distinct prime numbers multiplied together. It has a total of eighteen divisors.

## Prime factorization of 1280:

### 28 × 5

(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 5)

See below for interesting mathematical facts about the number 1280 from the Numbermatics database.

### Names of 1280

• Cardinal: 1280 can be written as One thousand, two hundred eighty.

### Scientific notation

• Scientific notation: 1.28 × 103

### Factors of 1280

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 7

### Divisors of 1280

• Number of divisors d(n): 18
• Complete list of divisors:
• Sum of all divisors σ(n): 3066
• Sum of proper divisors (its aliquot sum) s(n): 1786
• 1280 is an abundant number, because the sum of its proper divisors (1786) is greater than itself. Its abundance is 506

### Bases of 1280

• Binary: 101000000002
• Base-36: ZK

### Squares and roots of 1280

• 1280 squared (12802) is 1638400
• 1280 cubed (12803) is 2097152000
• The square root of 1280 is 35.7770876399
• The cube root of 1280 is 10.8576704663

### Scales and comparisons

How big is 1280?
• 1,280 seconds is equal to 21 minutes, 20 seconds.
• To count from 1 to 1,280 would take you about twenty-one 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 1280 cubic inches would be around 0.9 feet tall.

### Recreational maths with 1280

• 1280 backwards is 0821
• The number of decimal digits it has is: 4
• The sum of 1280's digits is 11
• More coming soon!