# 87

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

What does the number 87 look like?

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

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: 10101112
• 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. (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!