81342720

Names of 81342720

• Cardinal: 81342720 can be written as Eighty-one million, three hundred forty-two thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.134272 × 10⁷

Factors of 81342720

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 340

Divisors of 81342720

• Number of divisors d(n): 216
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 16 18 20 23 24 30 32 36 40 45 46 48 60 64 69 72 80 90 92 96 115 120 128 138 144 160 180 184 192 207 230 240 256 276 288 307 320 345 360 368 384 414 460 480 552 576 614 640 690 720 736 768 828 920 921 960 1035 1104 1152 1228 1280 1380 1440 1472 1535 1656 1840 1842 1920 2070 2208 2304 2456 2760 2763 2880 2944 3070 3312 3680 3684 3840 4140 4416 4605 4912 5520 5526 5760 5888 6140 6624 7061 7360 7368 8280 8832 9210 9824 11040 11052 11520 12280 13248 13815 14122 14720 14736 16560 17664 18420 19648 21183 22080 22104 24560 26496 27630 28244 29440 29472 33120 35305 36840 39296 42366 44160 44208 49120 52992 55260 56488 58944 63549 66240 70610 73680 78592 84732 88320 88416 98240 105915 110520 112976 117888 127098 132480 141220 147360 169464 176832 196480 211830 221040 225952 235776 254196 264960 282440 294720 317745 338928 353664 392960 423660 442080 451904 508392 564880 589440 635490 677856 707328 847320 884160 903808 1016784 1129760 1178880 1270980 1355712 1694640 1768320 1807616 2033568 2259520 2541960 2711424 3389280 3536640 4067136 4519040 5083920 5422848 6778560 8134272 9038080 10167840 13557120 16268544 20335680 27114240 40671360 81342720
• Sum of all divisors σ(n): 294630336
• Sum of proper divisors (its aliquot sum) s(n): 213287616
• 81342720 is an abundant number, because the sum of its proper divisors (213287616) is greater than itself. Its abundance is 131944896

Bases of 81342720

• Binary: 100110110010011000100000000₂
• Hexadecimal: 0x4D93100
• Base-36: 1CFGG0

Squares and roots of 81342720

• 81342720 squared (81342720²) is 6616638096998400
• 81342720 cubed (81342720³) is 538215340065473691648000
• The square root of 81342720 is 9019.0199024063
• The cube root of 81342720 is 433.2842442751

Scales and comparisons

• 81,342,720 seconds is equal to 2 years, 30 weeks, 3 days, 11 hours, 12 minutes.
• To count from 1 to 81,342,720 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 81342720 cubic inches would be around 36.1 feet tall.

Recreational maths with 81342720

• 81342720 backwards is 02724318
• The number of decimal digits it has is: 8
• The sum of 81342720's digits is 27
• More coming soon!