81645013240

Names of 81645013240

• Cardinal: 81645013240 can be written as Eighty-one billion, six hundred forty-five million, thirteen thousand, two hundred forty.

Scientific notation

• Scientific notation: 8.164501324 × 10¹⁰

Factors of 81645013240

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 504

Divisors of 81645013240

• Number of divisors d(n): 384
• Complete list of divisors:
  1 2 4 5 7 8 10 14 19 20 28 35 38 40 49 56 61 70 76 95 98 122 127 133 140 152 190 196 244 245 254 266 280 283 305 380 392 427 488 490 508 532 566 610 635 665 760 854 889 931 980 1016 1064 1132 1159 1220 1270 1330 1415 1708 1778 1862 1960 1981 2135 2264 2318 2413 2440 2540 2660 2830 2989 3416 3556 3724 3962 4270 4445 4636 4655 4826 5080 5320 5377 5660 5795 5978 6223 7112 7448 7747 7924 8113 8540 8890 9272 9310 9652 9905 10754 11320 11590 11956 12065 12446 13867 14945 15494 15848 16226 16891 17080 17263 17780 18620 19304 19810 21508 23180 23912 24130 24892 26885 27734 29890 30988 31115 32452 33782 34526 35560 35941 37240 37639 38735 39620 40565 43016 46360 48260 49784 53770 54229 55468 56791 59780 61976 62230 64904 67564 69052 69335 71882 75278 77470 79240 81130 84455 86315 96520 107540 108458 110936 113582 118237 119560 120841 124460 135128 138104 138670 143764 147193 150556 154940 162260 168910 172630 179705 188195 215080 216916 227164 236474 241682 248920 251587 263473 271145 277340 283955 287528 294386 301112 309880 324520 327997 337820 345260 359410 376390 379603 433832 454328 472948 483364 503174 526946 542290 554680 567910 588772 591185 604205 655994 675640 682879 690520 718820 735965 752780 759206 845887 945896 966728 1006348 1030351 1053892 1084580 1135820 1177544 1182370 1208410 1257935 1311988 1317365 1365758 1437640 1471930 1505560 1518412 1639985 1691774 1761109 1898015 2012696 2060702 2107784 2169160 2192401 2271640 2295979 2364740 2416820 2515870 2623976 2634730 2731516 2943860 3036824 3279970 3383548 3414395 3522218 3796030 4121404 4229435 4384802 4591958 4729480 4780153 4833640 5031740 5151755 5269460 5463032 5887720 6559940 6767096 6828790 7044436 7212457 7592060 8242808 8458870 8769604 8805545 9183916 9560306 10063480 10303510 10538920 10962005 11479895 13119880 13657580 14088872 14424914 15184120 15346807 16071853 16917740 17539208 17611090 18367832 19120612 20607020 21924010 22959790 23900765 27315160 28849828 30693614 32143706 33461071 33835480 35222180 36062285 38241224 41214040 41655619 43848020 45919580 47801530 57699656 61387228 64287412 66922142 70444360 72124570 76734035 80359265 83311238 87696040 91839160 95603060 107427649 122774456 128574824 133844284 144249140 153468070 160718530 166622476 167305355 191206120 208278095 214855298 267688568 288498280 291589333 306936140 321437060 333244952 334610710 416556190 429710596 537138245 583178666 613872280 642874120 669221420 833112380 859421192 1074276490 1166357332 1338442840 1457946665 1666224760 2041125331 2148552980 2332714664 2915893330 4082250662 4297105960 5831786660 8164501324 10205626655 11663573320 16329002648 20411253310 40822506620 81645013240
• Sum of all divisors σ(n): 231242342400
• Sum of proper divisors (its aliquot sum) s(n): 149597329160
• 81645013240 is an abundant number, because the sum of its proper divisors (149597329160) is greater than itself. Its abundance is 67952315920

Bases of 81645013240

• Binary: 1001100000010011011000000100011111000₂
• Hexadecimal: 0x13026C08F8
• Base-36: 11I9BZEG

Squares and roots of 81645013240

• 81645013240 squared (81645013240²) is 6665908186959775297600
• 81645013240 cubed (81645013240³) is 544238162180955249519976940224000
• The square root of 81645013240 is 285735.9152084315
• The cube root of 81645013240 is 4338.2031757191

Scales and comparisons

• 81,645,013,240 seconds is equal to 2,596 years, 3 weeks, 10 hours, 20 minutes, 40 seconds.
• To count from 1 to 81,645,013,240 would take you about five thousand, one hundred ninety-two 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 81645013240 cubic inches would be around 361.5 feet tall.

Recreational maths with 81645013240

• 81645013240 backwards is 04231054618
• The number of decimal digits it has is: 11
• The sum of 81645013240's digits is 34
• More coming soon!