# 128720

## 128,720 is an even composite number composed of three prime numbers multiplied together.

What does the number 128720 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 20 divisors.

128720 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twenty divisors.

## Prime factorization of 128720:

### 24 × 5 × 1609

(2 × 2 × 2 × 2 × 5 × 1609)

See below for interesting mathematical facts about the number 128720 from the Numbermatics database.

### Names of 128720

• Cardinal: 128720 can be written as One hundred twenty-eight thousand, seven hundred twenty.

### Scientific notation

• Scientific notation: 1.2872 × 105

### Factors of 128720

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 1616

### Divisors of 128720

• Number of divisors d(n): 20
• Complete list of divisors:
• Sum of all divisors σ(n): 299460
• Sum of proper divisors (its aliquot sum) s(n): 170740
• 128720 is an abundant number, because the sum of its proper divisors (170740) is greater than itself. Its abundance is 42020

### Bases of 128720

• Binary: 111110110110100002
• Base-36: 2RBK

### Squares and roots of 128720

• 128720 squared (1287202) is 16568838400
• 128720 cubed (1287203) is 2132740878848000
• The square root of 128720 is 358.7756959439
• The cube root of 128720 is 50.4911594497

### Scales and comparisons

How big is 128720?
• 128,720 seconds is equal to 1 day, 11 hours, 45 minutes, 20 seconds.
• To count from 1 to 128,720 would take you about eleven hours.

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 128720 cubic inches would be around 4.2 feet tall.

### Recreational maths with 128720

• 128720 backwards is 027821
• 128720 is a Harshad number.
• The number of decimal digits it has is: 6
• The sum of 128720's digits is 20
• More coming soon!

MLA style:
"Number 128720 - Facts about the integer". Numbermatics.com. 2021. Web. 20 October 2021.

APA style:
Numbermatics. (2021). Number 128720 - Facts about the integer. Retrieved 20 October 2021, from https://numbermatics.com/n/128720/

Chicago style:
Numbermatics. 2021. "Number 128720 - Facts about the integer". https://numbermatics.com/n/128720/

The information we have on file for 128720 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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