# 280

## 280 is an even composite number composed of three prime numbers multiplied together.

What does the number 280 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 16 divisors.

280 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of sixteen divisors.

## Prime factorization of 280:

### 23 × 5 × 7

(2 × 2 × 2 × 5 × 7)

See below for interesting mathematical facts about the number 280 from the Numbermatics database.

### Names of 280

• Cardinal: 280 can be written as Two hundred eighty.

### Scientific notation

• Scientific notation: 2.8 × 102

### Factors of 280

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 14

### Divisors of 280

• Number of divisors d(n): 16
• Complete list of divisors:
• Sum of all divisors σ(n): 720
• Sum of proper divisors (its aliquot sum) s(n): 440
• 280 is an abundant number, because the sum of its proper divisors (440) is greater than itself. Its abundance is 160

### Bases of 280

• Binary: 1000110002
• Base-36: 7S

### Squares and roots of 280

• 280 squared (2802) is 78400
• 280 cubed (2803) is 21952000
• The square root of 280 is 16.7332005307
• The cube root of 280 is 6.5421326203

### Scales and comparisons

How big is 280?
• 280 seconds is equal to 4 minutes, 40 seconds.
• To count from 1 to 280 would take you about two 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 280 cubic inches would be around 0.5 feet tall.

### Recreational maths with 280

• 280 backwards is 082
• 280 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 280's digits is 10
• More coming soon!