# 642

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

What does the number 642 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

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

## Prime factorization of 642:

### 2 × 3 × 107

See below for interesting mathematical facts about the number 642 from the Numbermatics database.

### Names of 642

• Cardinal: 642 can be written as Six hundred forty-two.

### Scientific notation

• Scientific notation: 6.42 × 102

### Factors of 642

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 112

### Divisors of 642

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 1296
• Sum of proper divisors (its aliquot sum) s(n): 654
• 642 is an abundant number, because the sum of its proper divisors (654) is greater than itself. Its abundance is 12

### Bases of 642

• Binary: 10100000102
• Base-36: HU

### Squares and roots of 642

• 642 squared (6422) is 412164
• 642 cubed (6423) is 264609288
• The square root of 642 is 25.3377189185
• The cube root of 642 is 8.6267062367

### Scales and comparisons

How big is 642?
• 642 seconds is equal to 10 minutes, 42 seconds.
• To count from 1 to 642 would take you about five 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 642 cubic inches would be around 0.7 feet tall.

### Recreational maths with 642

• 642 backwards is 246
• The number of decimal digits it has is: 3
• The sum of 642's digits is 12
• More coming soon!