81438720
81,438,720 is an even composite number composed of five prime numbers multiplied together.
81438720 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred ninety-two divisors.
Prime factorization of 81438720:
211 × 3 × 5 × 11 × 241
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 5 × 11 × 241)See below for interesting mathematical facts about the number 81438720 from the Numbermatics database.
Names of 81438720
- Cardinal: 81438720 can be written as Eighty-one million, four hundred thirty-eight thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 8.143872 × 107
Factors of 81438720
Divisors of 81438720
- Number of divisors d(n): 192
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Complete list of divisors:
1 2 3 4 5 6 8 10 11 12 15 16 20 22 24 30 32 33 40 44 48 55 60 64 66 80 88 96 110 120 128 132 160 165 176 192 220 240 241 256 264 320 330 352 384 440 480 482 512 528 640 660 704 723 768 880 960 964 1024 1056 1205 1280 1320 1408 1446 1536 1760 1920 1928 2048 2112 2410 2560 2640 2651 2816 2892 3072 3520 3615 3840 3856 4224 4820 5120 5280 5302 5632 5784 6144 7040 7230 7680 7712 7953 8448 9640 10240 10560 10604 11264 11568 13255 14080 14460 15360 15424 15906 16896 19280 21120 21208 22528 23136 26510 28160 28920 30720 30848 31812 33792 38560 39765 42240 42416 46272 53020 56320 57840 61696 63624 67584 77120 79530 84480 84832 92544 106040 112640 115680 123392 127248 154240 159060 168960 169664 185088 212080 231360 246784 254496 308480 318120 337920 339328 370176 424160 462720 493568 508992 616960 636240 678656 740352 848320 925440 1017984 1233920 1272480 1357312 1480704 1696640 1850880 2035968 2467840 2544960 2714624 3393280 3701760 4071936 5089920 5429248 6786560 7403520 8143872 10179840 13573120 16287744 20359680 27146240 40719360 81438720
- Sum of all divisors σ(n): 285405120
- Sum of proper divisors (its aliquot sum) s(n): 203966400
- 81438720 is an abundant number, because the sum of its proper divisors (203966400) is greater than itself. Its abundance is 122527680
Bases of 81438720
- Binary: 1001101101010101000000000002
- Hexadecimal: 0x4DAA800
- Base-36: 1CHIIO
Squares and roots of 81438720
- 81438720 squared (814387202) is 6632265115238400
- 81438720 cubed (814387203) is 540123181685667790848000
-
The
square root of 81438720 is 9024.3404191109 -
The
cube root of 81438720 is 433.4546300809
Scales and comparisons
How big is 81438720?- 81,438,720 seconds is equal to 2 years, 30 weeks, 4 days, 13 hours, 52 minutes.
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To count from 1 to 81,438,720 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 81438720 cubic inches would be around 36.1 feet tall.
Recreational maths with 81438720
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The information we have on file for 81438720 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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