81438240
81,438,240 is an even composite number composed of six prime numbers multiplied together.
81438240 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred ninety-two divisors.
Prime factorization of 81438240:
25 × 3 × 5 × 13 × 31 × 421
(2 × 2 × 2 × 2 × 2 × 3 × 5 × 13 × 31 × 421)See below for interesting mathematical facts about the number 81438240 from the Numbermatics database.
Names of 81438240
- Cardinal: 81438240 can be written as Eighty-one million, four hundred thirty-eight thousand, two hundred forty.
Scientific notation
- Scientific notation: 8.143824 × 107
Factors of 81438240
Divisors of 81438240
- Number of divisors d(n): 192
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Complete list of divisors:
1 2 3 4 5 6 8 10 12 13 15 16 20 24 26 30 31 32 39 40 48 52 60 62 65 78 80 93 96 104 120 124 130 155 156 160 186 195 208 240 248 260 310 312 372 390 403 416 421 465 480 496 520 620 624 744 780 806 842 930 992 1040 1209 1240 1248 1263 1488 1560 1612 1684 1860 2015 2080 2105 2418 2480 2526 2976 3120 3224 3368 3720 4030 4210 4836 4960 5052 5473 6045 6240 6315 6448 6736 7440 8060 8420 9672 10104 10946 12090 12630 12896 13051 13472 14880 16120 16419 16840 19344 20208 21892 24180 25260 26102 27365 32240 32838 33680 38688 39153 40416 43784 48360 50520 52204 54730 64480 65255 65676 67360 78306 82095 87568 96720 101040 104408 109460 130510 131352 156612 164190 169663 175136 193440 195765 202080 208816 218920 261020 262704 313224 328380 339326 391530 417632 437840 508989 522040 525408 626448 656760 678652 783060 848315 875680 1017978 1044080 1252896 1313520 1357304 1566120 1696630 2035956 2088160 2544945 2627040 2714608 3132240 3393260 4071912 5089890 5429216 6264480 6786520 8143824 10179780 13573040 16287648 20359560 27146080 40719120 81438240
- Sum of all divisors σ(n): 285852672
- Sum of proper divisors (its aliquot sum) s(n): 204414432
- 81438240 is an abundant number, because the sum of its proper divisors (204414432) is greater than itself. Its abundance is 122976192
Bases of 81438240
- Binary: 1001101101010100110001000002
- Hexadecimal: 0x4DAA620
- Base-36: 1CHI5C
Squares and roots of 81438240
- 81438240 squared (814382402) is 6632186934297600
- 81438240 cubed (814382403) is 540113631280192180224000
-
The
square root of 81438240 is 9024.3138243303 -
The
cube root of 81438240 is 433.4537784851
Scales and comparisons
How big is 81438240?- 81,438,240 seconds is equal to 2 years, 30 weeks, 4 days, 13 hours, 44 minutes.
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To count from 1 to 81,438,240 would take you about three years!
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 81438240 cubic inches would be around 36.1 feet tall.
Recreational maths with 81438240
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The information we have on file for 81438240 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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