81990720
81,990,720 is an even composite number composed of five prime numbers multiplied together.
81990720 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of three hundred thirty-six divisors.
Prime factorization of 81990720:
26 × 32 × 5 × 73 × 83
(2 × 2 × 2 × 2 × 2 × 2 × 3 × 3 × 5 × 7 × 7 × 7 × 83)See below for interesting mathematical facts about the number 81990720 from the Numbermatics database.
Names of 81990720
- Cardinal: 81990720 can be written as Eighty-one million, nine hundred ninety thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 8.199072 × 107
Factors of 81990720
Divisors of 81990720
- Number of divisors d(n): 336
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Complete list of divisors:
1 2 3 4 5 6 7 8 9 10 12 14 15 16 18 20 21 24 28 30 32 35 36 40 42 45 48 49 56 60 63 64 70 72 80 83 84 90 96 98 105 112 120 126 140 144 147 160 166 168 180 192 196 210 224 240 245 249 252 280 288 294 315 320 332 336 343 360 392 415 420 441 448 480 490 498 504 560 576 581 588 630 664 672 686 720 735 747 784 830 840 882 960 980 996 1008 1029 1120 1162 1176 1245 1260 1328 1344 1372 1440 1470 1494 1568 1660 1680 1715 1743 1764 1960 1992 2016 2058 2205 2240 2324 2352 2490 2520 2656 2744 2880 2905 2940 2988 3087 3136 3320 3360 3430 3486 3528 3735 3920 3984 4032 4067 4116 4410 4648 4704 4980 5040 5145 5229 5312 5488 5810 5880 5976 6174 6640 6720 6860 6972 7056 7470 7840 7968 8134 8232 8715 8820 9296 9408 9960 10080 10290 10458 10976 11620 11760 11952 12201 12348 13280 13720 13944 14112 14940 15435 15680 15936 16268 16464 17430 17640 18592 19920 20160 20335 20580 20916 21952 23240 23520 23904 24402 24696 26145 26560 27440 27888 28224 28469 29880 30870 32536 32928 34860 35280 36603 37184 39840 40670 41160 41832 46480 47040 47808 48804 49392 52290 54880 55776 56938 59760 61005 61740 65072 65856 69720 70560 73206 79680 81340 82320 83664 85407 92960 97608 98784 104580 109760 111552 113876 119520 122010 123480 130144 139440 141120 142345 146412 162680 164640 167328 170814 183015 185920 195216 197568 209160 227752 239040 244020 246960 256221 260288 278880 284690 292824 325360 329280 334656 341628 366030 390432 418320 427035 455504 488040 493920 512442 557760 569380 585648 650720 683256 732060 780864 836640 854070 911008 976080 987840 1024884 1138760 1171296 1281105 1301440 1366512 1464120 1673280 1708140 1822016 1952160 2049768 2277520 2342592 2562210 2733024 2928240 3416280 3904320 4099536 4555040 5124420 5466048 5856480 6832560 8199072 9110080 10248840 11712960 13665120 16398144 20497680 27330240 40995360 81990720
- Sum of all divisors σ(n): 332841600
- Sum of proper divisors (its aliquot sum) s(n): 250850880
- 81990720 is an abundant number, because the sum of its proper divisors (250850880) is greater than itself. Its abundance is 168860160
Bases of 81990720
- Binary: 1001110001100010100010000002
- Hexadecimal: 0x4E31440
- Base-36: 1CTCG0
Squares and roots of 81990720
- 81990720 squared (819907202) is 6722478166118400
- 81990720 cubed (819907203) is 551180825024327221248000
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The
square root of 81990720 is 9054.8727213583 -
The
cube root of 81990720 is 434.4317590203
Scales and comparisons
How big is 81990720?- 81,990,720 seconds is equal to 2 years, 31 weeks, 3 days, 23 hours, 12 minutes.
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To count from 1 to 81,990,720 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 81990720 cubic inches would be around 36.2 feet tall.
Recreational maths with 81990720
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