# 1687

## 1,687 is an odd composite number composed of two prime numbers multiplied together.

What does the number 1687 look like?

This visualization shows the relationship between its 2 prime factors (large circles) and 4 divisors.

1687 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of four divisors.

## Prime factorization of 1687:

### 7 × 241

See below for interesting mathematical facts about the number 1687 from the Numbermatics database.

### Names of 1687

• Cardinal: 1687 can be written as One thousand, six hundred eighty-seven.

### Scientific notation

• Scientific notation: 1.687 × 103

### Factors of 1687

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 248

### Divisors of 1687

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 1936
• Sum of proper divisors (its aliquot sum) s(n): 249
• 1687 is a deficient number, because the sum of its proper divisors (249) is less than itself. Its deficiency is 1438

### Bases of 1687

• Binary: 110100101112
• Base-36: 1AV

### Squares and roots of 1687

• 1687 squared (16872) is 2845969
• 1687 cubed (16873) is 4801149703
• The square root of 1687 is 41.0731055559
• The cube root of 1687 is 11.9043319211

### Scales and comparisons

How big is 1687?
• 1,687 seconds is equal to 28 minutes, 7 seconds.
• To count from 1 to 1,687 would take you about twenty-eight 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 1687 cubic inches would be around 1 feet tall.

### Recreational maths with 1687

• 1687 backwards is 7861
• The number of decimal digits it has is: 4
• The sum of 1687's digits is 22
• More coming soon!