81789392720

Names of 81789392720

• Cardinal: 81789392720 can be written as Eighty-one billion, seven hundred eighty-nine million, three hundred ninety-two thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.178939272 × 10¹⁰

Factors of 81789392720

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 413

Divisors of 81789392720

• Number of divisors d(n): 400
• Complete list of divisors:
  1 2 4 5 7 8 10 14 16 19 20 28 35 38 40 49 56 70 73 76 80 95 98 112 133 140 146 152 190 196 245 266 280 292 304 307 343 365 380 392 490 511 532 560 584 614 665 686 730 760 784 931 980 1022 1064 1168 1228 1330 1372 1387 1460 1520 1535 1715 1862 1960 2044 2128 2149 2401 2456 2555 2660 2744 2774 2920 3070 3430 3577 3724 3920 4088 4298 4655 4802 4912 5110 5320 5488 5548 5833 5840 6140 6517 6860 6935 7154 7448 8176 8596 9310 9604 9709 10220 10640 10745 11096 11666 12005 12280 13034 13720 13870 14308 14896 15043 17192 17885 18620 19208 19418 20440 21490 22192 22411 23332 24010 24560 25039 26068 27440 27740 28616 29165 30086 32585 34384 35770 37240 38416 38836 40831 40880 42980 44822 45619 46664 48020 48545 50078 52136 55480 57232 58330 60172 65170 67963 71540 74480 75215 77672 81662 85960 89644 91238 93328 96040 97090 100156 104272 105301 110960 112055 116660 120344 125195 130340 135926 143080 150430 155344 156877 163324 171920 175273 179288 182476 192080 194180 200312 204155 210602 224110 228095 233320 240688 250390 260680 271852 285817 286160 300860 313754 326648 339815 350546 358576 364952 388360 400624 408310 421204 425809 448220 456190 466640 475741 500780 521360 526505 543704 571634 601720 627508 653296 679630 701092 729904 737107 776720 784385 816620 842408 851618 876365 896440 912380 951482 1001560 1053010 1087408 1098139 1143268 1203440 1255016 1359260 1402184 1429085 1474214 1568770 1633240 1684816 1703236 1752730 1792880 1824760 1902964 2000719 2003120 2106020 2129045 2196278 2286536 2378705 2510032 2718520 2804368 2858170 2948428 2980663 3137540 3266480 3330187 3406472 3505460 3649520 3685535 3805928 4001438 4212040 4258090 4392556 4573072 4757410 5437040 5490695 5716340 5896856 5961326 6275080 6660374 6812944 7010920 7371070 7611856 7686973 8002876 8424080 8516180 8785112 9514820 10003595 10981390 11432680 11793712 11922652 12550160 13320748 14005033 14021840 14742140 14903315 15373946 16005752 16650935 17032360 17570224 19029640 20007190 20864641 21962780 22865360 23845304 26641496 28010066 29484280 29806630 30747892 32011504 33301870 34064720 38059280 38434865 40014380 41729282 43925560 47690608 53282992 53808811 56020132 58968560 59613260 61495784 66603740 70025165 76869730 80028760 83458564 87851120 104323205 107617622 112040264 119226520 122991568 133207480 140050330 146052487 153739460 160057520 166917128 208646410 215235244 224080528 238453040 266414960 269044055 280100660 292104974 307478920 333834256 417292820 430470488 538088110 560201320 584209948 614957840 730262435 834585640 860940976 1022367409 1076176220 1120402640 1168419896 1460524870 1669171280 2044734818 2152352440 2336839792 2921049740 4089469636 4304704880 5111837045 5842099480 8178939272 10223674090 11684198960 16357878544 20447348180 40894696360 81789392720
• Sum of all divisors σ(n): 237486258240
• Sum of proper divisors (its aliquot sum) s(n): 155696865520
• 81789392720 is an abundant number, because the sum of its proper divisors (155696865520) is greater than itself. Its abundance is 73907472800

Bases of 81789392720

• Binary: 1001100001011000001110001011101010000₂
• Hexadecimal: 0x130B071750
• Base-36: 11KNAJBK

Squares and roots of 81789392720

• 81789392720 squared (81789392720²) is 6689504761506388998400
• 81789392720 cubed (81789392720³) is 547130532041155988579225051648000
• The square root of 81789392720 is 285988.4485779103
• The cube root of 81789392720 is 4340.7588683413

Scales and comparisons

• 81,789,392,720 seconds is equal to 2,600 years, 33 weeks, 5 days, 11 hours, 45 minutes, 20 seconds.
• To count from 1 to 81,789,392,720 would take you about five thousand, two hundred one 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 81789392720 cubic inches would be around 361.7 feet tall.

Recreational maths with 81789392720

• 81789392720 backwards is 02729398718
• 81789392720 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81789392720's digits is 56
• More coming soon!