# 7987

## 7,987 is an odd composite number composed of two prime numbers multiplied together.

What does the number 7987 look like?

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

7987 is an odd composite number. It is composed of two distinct prime numbers multiplied together. It has a total of six divisors.

## Prime factorization of 7987:

### 72 × 163

(7 × 7 × 163)

See below for interesting mathematical facts about the number 7987 from the Numbermatics database.

### Names of 7987

• Cardinal: 7987 can be written as Seven thousand, nine hundred eighty-seven.

### Scientific notation

• Scientific notation: 7.987 × 103

### Factors of 7987

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 170

### Divisors of 7987

• Number of divisors d(n): 6
• Complete list of divisors:
• Sum of all divisors σ(n): 9348
• Sum of proper divisors (its aliquot sum) s(n): 1361
• 7987 is a deficient number, because the sum of its proper divisors (1361) is less than itself. Its deficiency is 6626

### Bases of 7987

• Binary: 11111001100112
• Base-36: 65V

### Squares and roots of 7987

• 7987 squared (79872) is 63792169
• 7987 cubed (79873) is 509508053803
• The square root of 7987 is 89.3700173437
• The cube root of 7987 is 19.9891607933

### Scales and comparisons

How big is 7987?
• 7,987 seconds is equal to 2 hours, 13 minutes, 7 seconds.
• To count from 1 to 7,987 would take you about two hours.

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 7987 cubic inches would be around 1.7 feet tall.

### Recreational maths with 7987

• 7987 backwards is 7897
• The number of decimal digits it has is: 4
• The sum of 7987's digits is 31
• More coming soon!