# 990

## 990 is an even composite number composed of four prime numbers multiplied together.

What does the number 990 look like?

This visualization shows the relationship between its 4 prime factors (large circles) and 24 divisors.

990 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of twenty-four divisors.

## Prime factorization of 990:

### 2 × 32 × 5 × 11

(2 × 3 × 3 × 5 × 11)

See below for interesting mathematical facts about the number 990 from the Numbermatics database.

### Names of 990

• Cardinal: 990 can be written as Nine hundred ninety.

### Scientific notation

• Scientific notation: 9.9 × 102

### Factors of 990

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 21

### Divisors of 990

• Number of divisors d(n): 24
• Complete list of divisors:
• Sum of all divisors σ(n): 2808
• Sum of proper divisors (its aliquot sum) s(n): 1818
• 990 is an abundant number, because the sum of its proper divisors (1818) is greater than itself. Its abundance is 828

### Bases of 990

• Binary: 11110111102
• Hexadecimal: 0x3DE
• Base-36: RI

### Squares and roots of 990

• 990 squared (9902) is 980100
• 990 cubed (9903) is 970299000
• The square root of 990 is 31.4642654451
• The cube root of 990 is 9.9665549341

### Scales and comparisons

How big is 990?
• 990 seconds is equal to 16 minutes, 30 seconds.
• To count from 1 to 990 would take you about eight 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 990 cubic inches would be around 0.8 feet tall.

### Recreational maths with 990

• 990 backwards is 099
• 990 is a Harshad number.
• The number of decimal digits it has is: 3
• The sum of 990's digits is 18
• More coming soon!

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The information we have on file for 990 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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