# 285

## 285 is an odd composite number composed of three prime numbers multiplied together.

What does the number 285 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 8 divisors.

285 is an odd composite number. It is composed of three distinct prime numbers multiplied together. It has a total of eight divisors.

## Prime factorization of 285:

### 3 × 5 × 19

See below for interesting mathematical facts about the number 285 from the Numbermatics database.

### Names of 285

• Cardinal: 285 can be written as Two hundred eighty-five.

### Scientific notation

• Scientific notation: 2.85 × 102

### Factors of 285

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 3
• Sum of prime factors: 27

### Divisors of 285

• Number of divisors d(n): 8
• Complete list of divisors:
• Sum of all divisors σ(n): 480
• Sum of proper divisors (its aliquot sum) s(n): 195
• 285 is a deficient number, because the sum of its proper divisors (195) is less than itself. Its deficiency is 90

### Bases of 285

• Binary: 1000111012
• Base-36: 7X

### Squares and roots of 285

• 285 squared (2852) is 81225
• 285 cubed (2853) is 23149125
• The square root of 285 is 16.8819430161
• The cube root of 285 is 6.5808443655

### Scales and comparisons

How big is 285?
• 285 seconds is equal to 4 minutes, 45 seconds.
• To count from 1 to 285 would take you about two 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 285 cubic inches would be around 0.5 feet tall.

### Recreational maths with 285

• 285 backwards is 582
• 285 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 285's digits is 15
• More coming soon!