# 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!