# 428

## 428 is an even composite number composed of two prime numbers multiplied together.

What does the number 428 look like?

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

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

## Prime factorization of 428:

### 22 × 107

(2 × 2 × 107)

See below for interesting mathematical facts about the number 428 from the Numbermatics database.

### Names of 428

• Cardinal: 428 can be written as Four hundred twenty-eight.

### Scientific notation

• Scientific notation: 4.28 × 102

### Factors of 428

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 109

### Divisors of 428

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 756
• Sum of proper divisors (its aliquot sum) s(n): 328
• 428 is a deficient number, because the sum of its proper divisors (328) is less than itself. Its deficiency is 100

### Bases of 428

• Binary: 1101011002
• Base-36: BW

### Squares and roots of 428

• 428 squared (4282) is 183184
• 428 cubed (4283) is 78402752
• The square root of 428 is 20.6881608655
• The cube root of 428 is 7.5361220433

### Scales and comparisons

How big is 428?
• 428 seconds is equal to 7 minutes, 8 seconds.
• To count from 1 to 428 would take you about three 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 428 cubic inches would be around 0.6 feet tall.

### Recreational maths with 428

• 428 backwards is 824
• The number of decimal digits it has is: 3
• The sum of 428's digits is 14
• More coming soon!

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The information we have on file for 428 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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