81438402780

Names of 81438402780

• Cardinal: 81438402780 can be written as Eighty-one billion, four hundred thirty-eight million, four hundred two thousand, seven hundred eighty.

Scientific notation

• Scientific notation: 8.143840278 × 10¹⁰

Factors of 81438402780

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 1515

Divisors of 81438402780

• Number of divisors d(n): 432
• Complete list of divisors:
  1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 35 36 42 45 49 54 60 63 70 81 84 90 98 105 108 126 135 140 147 162 180 189 196 210 243 245 252 270 281 294 315 324 378 405 420 441 486 490 540 562 567 588 630 735 756 810 843 882 945 972 980 1124 1134 1215 1217 1260 1323 1405 1470 1620 1686 1701 1764 1890 1967 2205 2268 2430 2434 2529 2646 2810 2835 2940 3372 3402 3651 3780 3934 3969 4215 4410 4860 4868 5058 5292 5620 5670 5901 6085 6615 6804 7302 7587 7868 7938 8430 8505 8519 8820 9835 10116 10953 11340 11802 11907 12170 12645 13230 13769 14604 15174 15876 16860 17010 17038 17703 18255 19670 19845 21906 22761 23604 23814 24340 25290 25557 26460 27538 29505 30348 32859 34020 34076 35406 36510 37935 39340 39690 41307 42595 43812 45522 47628 50580 51114 53109 54765 55076 59010 59535 59633 65718 68283 68845 70812 73020 75870 76671 79380 82614 85190 88515 91044 98577 102228 106218 109530 113805 118020 119070 119266 123921 127785 131436 136566 137690 151740 153342 159327 164295 165228 170380 177030 178899 197154 206535 212436 219060 227610 230013 238140 238532 247842 255570 265545 273132 275380 295731 298165 306684 318654 328590 341415 341977 354060 357798 371763 383355 394308 413070 455220 460026 477981 492885 495684 511140 531090 536697 591462 596330 619605 637308 657180 682830 683954 690039 715596 743526 766710 796635 826140 894495 920052 955962 985770 1025931 1062180 1073394 1115289 1150065 1182924 1192660 1239210 1365660 1367908 1380078 1478655 1487052 1533420 1593270 1610091 1709885 1788990 1858815 1911924 1971540 2051862 2070117 2146788 2230578 2300130 2389905 2393839 2478420 2683485 2760156 2957310 3077793 3186540 3220182 3345867 3419770 3450195 3577980 3717630 4103724 4140234 4461156 4600260 4779810 4787678 4830273 5129655 5366970 5576445 5914620 6155586 6440364 6691734 6839540 6900390 7181517 7435260 8050455 8280468 9233379 9559620 9575356 9660546 10259310 10350585 10733940 11152890 11969195 12311172 13383468 13800780 14363034 14490819 15388965 16100910 16729335 16756873 18466758 19321092 20518620 20701170 21544551 22305780 23938390 24151365 27700137 28726068 28981638 30777930 32201820 33458670 33513746 35907585 36933516 41402340 43089102 46166895 47876780 48302730 50270619 55400274 57963276 61555860 64633653 66917340 67027492 71815170 72454095 83100411 83784365 86178204 92333790 96605460 100541238 107722755 110800548 129267306 138500685 143630340 144908190 150811857 166200822 167568730 184667580 193900959 201082476 215445510 251353095 258534612 277001370 289816380 301623714 323168265 332401644 335137460 387801918 415502055 430891020 452435571 502706190 554002740 581702877 603247428 646336530 754059285 775603836 831004110 904871142 969504795 1005412380 1163405754 1292673060 1357306713 1508118570 1662008220 1809742284 1939009590 2262177855 2326811508 2714613426 2908514385 3016237140 3878019180 4071920139 4524355710 5429226852 5817028770 6786533565 8143840278 9048711420 11634057540 13573067130 16287680556 20359600695 27146134260 40719201390 81438402780
• Sum of all divisors σ(n): 299310482016
• Sum of proper divisors (its aliquot sum) s(n): 217872079236
• 81438402780 is an abundant number, because the sum of its proper divisors (217872079236) is greater than itself. Its abundance is 136433676456

Bases of 81438402780

• Binary: 1001011110110000110110110100011011100₂
• Hexadecimal: 0x12F61B68DC
• Base-36: 11EUBLR0

Squares and roots of 81438402780

• 81438402780 squared (81438402780²) is 6632213447357511728400
• 81438402780 cubed (81438402780³) is 540116870048833366796013164952000
• The square root of 81438402780 is 285374.1452549615
• The cube root of 81438402780 is 4334.5406728277

Scales and comparisons

• 81,438,402,780 seconds is equal to 2,589 years, 25 weeks, 3 days, 2 hours, 33 minutes.
• To count from 1 to 81,438,402,780 would take you about five thousand, one hundred seventy-eight 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 81438402780 cubic inches would be around 361.2 feet tall.

Recreational maths with 81438402780

• 81438402780 backwards is 08720483418
• 81438402780 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81438402780's digits is 45
• More coming soon!