# 87

## 87 is an odd composite number composed of two prime numbers multiplied together.

87 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 87:

### 3 × 29

See below for interesting mathematical facts about the number 87 from the Numbermatics database.

### Names of 87

• Cardinal: 87 can be written as Eighty-seven.

### Scientific notation

• Scientific notation: 8.7 × 101

### Factors of 87

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 32

### Divisors of 87

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 120
• Sum of proper divisors (its aliquot sum) s(n): 33
• 87 is a deficient number, because the sum of its proper divisors (33) is less than itself. Its deficiency is 54

### Bases of 87

• Binary: 1010111 2
• Base-36: 2F

### Squares and roots of 87

• 87 squared (872) is 7569
• 87 cubed (873) is 658503
• The square root of 87 is 9.3273790531
• The cube root of 87 is 4.4310476217

### Scales and comparisons

How big is 87?
• 87 seconds is equal to 1 minute, 27 seconds.
• To count from 1 to 87 would take you about forty-three seconds.

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.

Note: we do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!

• A cube with a volume of 87 cubic inches would be around 0.4 feet tall.

### Recreational maths with 87

• 87 backwards is 78
• The number of decimal digits it has is: 2
• The sum of 87's digits is 15
• More coming soon!

The information we have on file for 87 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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