81139968
81,139,968 is an even composite number composed of five prime numbers multiplied together.
81139968 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of three hundred sixty divisors.
Prime factorization of 81139968:
28 × 34 × 7 × 13 × 43
(2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 3 × 3 × 7 × 13 × 43)See below for interesting mathematical facts about the number 81139968 from the Numbermatics database.
Names of 81139968
- Cardinal: 81139968 can be written as Eighty-one million, one hundred thirty-nine thousand, nine hundred sixty-eight.
Scientific notation
- Scientific notation: 8.1139968 × 107
Factors of 81139968
Divisors of 81139968
- Number of divisors d(n): 360
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Complete list of divisors:
1 2 3 4 6 7 8 9 12 13 14 16 18 21 24 26 27 28 32 36 39 42 43 48 52 54 56 63 64 72 78 81 84 86 91 96 104 108 112 117 126 128 129 144 156 162 168 172 182 189 192 208 216 224 234 252 256 258 273 288 301 312 324 336 344 351 364 378 384 387 416 432 448 468 504 516 546 559 567 576 602 624 648 672 688 702 728 756 768 774 819 832 864 896 903 936 1008 1032 1053 1092 1118 1134 1152 1161 1204 1248 1296 1344 1376 1404 1456 1512 1548 1638 1664 1677 1728 1792 1806 1872 2016 2064 2106 2184 2236 2268 2304 2322 2408 2457 2496 2592 2688 2709 2752 2808 2912 3024 3096 3276 3328 3354 3456 3483 3612 3744 3913 4032 4128 4212 4368 4472 4536 4644 4816 4914 4992 5031 5184 5376 5418 5504 5616 5824 6048 6192 6552 6708 6912 6966 7224 7371 7488 7826 8064 8127 8256 8424 8736 8944 9072 9288 9632 9828 9984 10062 10368 10836 11008 11232 11648 11739 12096 12384 13104 13416 13932 14448 14742 14976 15093 15652 16128 16254 16512 16848 17472 17888 18144 18576 19264 19656 20124 20736 21672 22464 23296 23478 24192 24381 24768 26208 26832 27864 28896 29484 29952 30186 31304 32508 33024 33696 34944 35217 35776 36288 37152 38528 39312 40248 43344 44928 45279 46956 48384 48762 49536 52416 53664 55728 57792 58968 60372 62608 65016 67392 69888 70434 71552 72576 74304 77056 78624 80496 86688 89856 90558 93912 97524 99072 104832 105651 107328 111456 115584 117936 120744 125216 130032 134784 140868 143104 145152 148608 157248 160992 173376 181116 187824 195048 209664 211302 214656 222912 231168 235872 241488 250432 260064 269568 281736 297216 314496 316953 321984 346752 362232 375648 390096 422604 429312 445824 471744 482976 500864 520128 563472 628992 633906 643968 693504 724464 751296 780192 845208 891648 943488 965952 1001728 1040256 1126944 1267812 1287936 1448928 1502592 1560384 1690416 1886976 1931904 2080512 2253888 2535624 2897856 3005184 3120768 3380832 3863808 4507776 5071248 5795712 6241536 6761664 9015552 10142496 11591424 13523328 20284992 27046656 40569984 81139968
- Sum of all divisors σ(n): 304703168
- Sum of proper divisors (its aliquot sum) s(n): 223563200
- 81139968 is an abundant number, because the sum of its proper divisors (223563200) is greater than itself. Its abundance is 142423232
Bases of 81139968
- Binary: 1001101011000011001000000002
- Hexadecimal: 0x4D61900
- Base-36: 1CB400
Squares and roots of 81139968
- 81139968 squared (811399682) is 6583694407041024
- 81139968 cubed (811399683) is 534200753509087662047232
-
The
square root of 81139968 is 9007.7726436673 -
The
cube root of 81139968 is 432.9239484045
Scales and comparisons
How big is 81139968?- 81,139,968 seconds is equal to 2 years, 30 weeks, 1 day, 2 hours, 52 minutes, 48 seconds.
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To count from 1 to 81,139,968 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 81139968 cubic inches would be around 36.1 feet tall.
Recreational maths with 81139968
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