# 85

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

What does the number 85 look like?

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

85 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 85:

### 5 × 17

See below for interesting mathematical facts about the number 85 from the Numbermatics database.

### Names of 85

• Cardinal: 85 can be written as Eighty-five.

### Scientific notation

• Scientific notation: 8.5 × 101

### Factors of 85

• Number of distinct prime factors ω(n): 2
• Total number of prime factors Ω(n): 2
• Sum of prime factors: 22

### Divisors of 85

• Number of divisors d(n): 4
• Complete list of divisors:
• Sum of all divisors σ(n): 108
• Sum of proper divisors (its aliquot sum) s(n): 23
• 85 is a deficient number, because the sum of its proper divisors (23) is less than itself. Its deficiency is 62

### Bases of 85

• Binary: 10101012
• Base-36: 2D

### Squares and roots of 85

• 85 squared (852) is 7225
• 85 cubed (853) is 614125
• The square root of 85 is 9.2195444573
• The cube root of 85 is 4.3968296719

### Scales and comparisons

How big is 85?
• 85 seconds is equal to 1 minute, 25 seconds.
• To count from 1 to 85 would take you about forty-two 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 85 cubic inches would be around 0.4 feet tall.

### Recreational maths with 85

• 85 backwards is 58
• The number of decimal digits it has is: 2
• The sum of 85's digits is 13
• More coming soon!