81375840

Names of 81375840

• Cardinal: 81375840 can be written as Eighty-one million, three hundred seventy-five thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.137584 × 10⁷

Factors of 81375840

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 53

Divisors of 81375840

• Number of divisors d(n): 576
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 12 13 14 15 16 18 20 21 23 24 26 27 28 30 32 35 36 39 40 42 45 46 48 52 54 56 60 63 65 69 70 72 78 80 81 84 90 91 92 96 104 105 108 112 115 117 120 126 130 135 138 140 144 156 160 161 162 168 180 182 184 189 195 207 208 210 216 224 230 234 240 243 252 260 270 273 276 280 288 299 312 315 322 324 336 345 351 360 364 368 378 390 405 414 416 420 432 455 460 468 480 483 486 504 520 540 546 552 560 567 585 598 621 624 630 644 648 672 690 702 720 728 736 756 780 805 810 819 828 840 864 897 910 920 936 945 966 972 1008 1035 1040 1053 1080 1092 1104 1120 1134 1170 1196 1215 1242 1248 1260 1288 1296 1365 1380 1404 1440 1449 1456 1495 1512 1560 1610 1620 1638 1656 1680 1701 1755 1794 1820 1840 1863 1872 1890 1932 1944 2016 2070 2080 2093 2106 2160 2184 2208 2268 2340 2392 2415 2430 2457 2484 2520 2576 2592 2691 2730 2760 2808 2835 2898 2912 2990 3024 3105 3120 3159 3220 3240 3276 3312 3360 3402 3510 3588 3640 3680 3726 3744 3780 3864 3888 4095 4140 4186 4212 4320 4347 4368 4485 4536 4680 4784 4830 4860 4914 4968 5040 5152 5265 5382 5460 5520 5589 5616 5670 5796 5980 6048 6210 6240 6279 6318 6440 6480 6552 6624 6804 7020 7176 7245 7280 7371 7452 7560 7728 7776 8073 8190 8280 8372 8424 8505 8694 8736 8970 9072 9315 9360 9568 9660 9720 9828 9936 10080 10465 10530 10764 10920 11040 11178 11232 11340 11592 11960 12285 12420 12558 12636 12880 12960 13041 13104 13455 13608 14040 14352 14490 14560 14742 14904 15120 15456 15795 16146 16380 16560 16744 16848 17010 17388 17940 18144 18630 18720 18837 19320 19440 19656 19872 20930 21060 21528 21735 21840 22113 22356 22680 23184 23920 24219 24570 24840 25116 25272 25760 26082 26208 26910 27216 27945 28080 28704 28980 29484 29808 30240 31395 31590 32292 32760 33120 33488 33696 34020 34776 35880 36855 37260 37674 38640 38880 39123 39312 40365 41860 42120 43056 43470 43680 44226 44712 45360 46368 47840 48438 49140 49680 50232 50544 52164 53820 54432 55890 56160 56511 57960 58968 59616 62790 63180 64584 65205 65520 66976 68040 69552 71760 72657 73710 74520 75348 77280 78246 78624 80730 83720 84240 86112 86940 88452 89424 90720 94185 96876 98280 99360 100464 101088 104328 107640 110565 111780 113022 115920 117936 121095 125580 126360 129168 130410 131040 136080 139104 143520 145314 147420 149040 150696 156492 161460 167440 168480 169533 173880 176904 178848 188370 193752 195615 196560 200928 208656 215280 221130 223560 226044 231840 235872 242190 251160 252720 258336 260820 272160 282555 290628 294840 298080 301392 312984 322920 334880 339066 347760 353808 363285 376740 387504 391230 393120 417312 430560 442260 447120 452088 484380 502320 505440 508599 521640 565110 581256 589680 602784 625968 645840 678132 695520 707616 726570 753480 775008 782460 847665 884520 894240 904176 968760 1004640 1017198 1043280 1130220 1162512 1179360 1251936 1291680 1356264 1453140 1506960 1564920 1695330 1769040 1808352 1937520 2034396 2086560 2260440 2325024 2542995 2712528 2906280 3013920 3129840 3390660 3538080 3875040 4068792 4520880 5085990 5425056 5812560 6259680 6781320 8137584 9041760 10171980 11625120 13562640 16275168 20343960 27125280 40687920 81375840
• Sum of all divisors σ(n): 369847296
• Sum of proper divisors (its aliquot sum) s(n): 288471456
• 81375840 is an abundant number, because the sum of its proper divisors (288471456) is greater than itself. Its abundance is 207095616

Bases of 81375840

• Binary: 100110110011011001001100000₂
• Hexadecimal: 0x4D9B260
• Base-36: 1CG600

Squares and roots of 81375840

• 81375840 squared (81375840²) is 6622027335705600
• 81375840 cubed (81375840³) is 538873036946005192704000
• The square root of 81375840 is 9020.8558352301
• The cube root of 81375840 is 433.3430425175

Scales and comparisons

• 81,375,840 seconds is equal to 2 years, 30 weeks, 3 days, 20 hours, 24 minutes.
• To count from 1 to 81,375,840 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 81375840 cubic inches would be around 36.1 feet tall.

Recreational maths with 81375840

• 81375840 backwards is 04857318
• 81375840 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81375840's digits is 36
• More coming soon!