21289728
21,289,728 is an even composite number composed of four prime numbers multiplied together.
21289728 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of seventy-two divisors.
Prime factorization of 21289728:
28 × 3 × 19 × 1459
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 19 × 1459)See below for interesting mathematical facts about the number 21289728 from the Numbermatics database.
Names of 21289728
- Cardinal: 21289728 can be written as Twenty-one million, two hundred eighty-nine thousand, seven hundred twenty-eight.
Scientific notation
- Scientific notation: 2.1289728 × 107
Factors of 21289728
Divisors of 21289728
- Number of divisors d(n): 72
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Complete list of divisors:
1 2 3 4 6 8 12 16 19 24 32 38 48 57 64 76 96 114 128 152 192 228 256 304 384 456 608 768 912 1216 1459 1824 2432 2918 3648 4377 4864 5836 7296 8754 11672 14592 17508 23344 27721 35016 46688 55442 70032 83163 93376 110884 140064 166326 186752 221768 280128 332652 373504 443536 560256 665304 887072 1120512 1330608 1774144 2661216 3548288 5322432 7096576 10644864 21289728
- Sum of all divisors σ(n): 59684800
- Sum of proper divisors (its aliquot sum) s(n): 38395072
- 21289728 is an abundant number, because the sum of its proper divisors (38395072) is greater than itself. Its abundance is 17105344
Bases of 21289728
- Binary: 10100010011011011000000002
- Hexadecimal: 0x144DB00
- Base-36: COB9C
Squares and roots of 21289728
- 21289728 squared (212897282) is 453252518313984
- 21289728 cubed (212897283) is 9649622830219737956352
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The
square root of 21289728 is 4614.0793231153 -
The
cube root of 21289728 is 277.1554167871
Scales and comparisons
How big is 21289728?- 21,289,728 seconds is equal to 35 weeks, 1 day, 9 hours, 48 minutes, 48 seconds.
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To count from 1 to 21,289,728 would take you about five days!
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 21289728 cubic inches would be around 23.1 feet tall.
Recreational maths with 21289728
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The information we have on file for 21289728 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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