81040021440

Names of 81040021440

• Cardinal: 81040021440 can be written as Eighty-one billion, forty million, twenty-one thousand, four hundred forty.

Scientific notation

• Scientific notation: 8.104002144 × 10¹⁰

Factors of 81040021440

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 121

Divisors of 81040021440

• Number of divisors d(n): 448
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 31 32 35 40 42 48 56 60 62 64 70 73 80 84 93 96 105 112 120 124 140 146 155 160 168 186 192 210 217 219 224 240 248 280 292 310 320 336 365 372 420 434 438 448 465 480 496 511 560 584 620 651 672 730 744 840 868 876 930 960 992 1022 1085 1095 1120 1168 1240 1302 1344 1460 1488 1533 1680 1736 1752 1860 1984 2044 2170 2190 2240 2263 2336 2480 2555 2604 2920 2976 3066 3255 3360 3472 3504 3720 4088 4340 4380 4526 4672 4960 5110 5208 5329 5840 5952 6132 6510 6720 6789 6944 7008 7440 7665 8176 8680 8760 9052 9920 10220 10416 10658 11315 11680 12264 13020 13578 13888 14016 14880 15330 15841 15987 16352 17360 17520 18104 20440 20832 21316 22630 23360 24528 26040 26645 27156 29760 30660 31682 31974 32704 33945 34720 35040 36208 37303 40880 41664 42632 45260 47523 49056 52080 53290 54312 61320 63364 63948 67890 69440 70080 72416 74606 79205 79935 81760 85264 90520 95046 98112 104160 106580 108624 111909 122640 126728 127896 135780 144832 149212 158410 159870 163520 165199 170528 181040 186515 190092 208320 213160 217248 223818 237615 245280 253456 255792 271560 298424 316820 319740 330398 341056 362080 373030 380184 389017 426320 434496 447636 475230 490560 495597 506912 511584 543120 559545 596848 633640 639480 660796 724160 746060 760368 778034 825995 852640 895272 950460 991194 1013824 1023168 1086240 1119090 1156393 1167051 1193696 1267280 1278960 1321592 1492120 1520736 1556068 1651990 1705280 1790544 1900920 1945085 1982388 2172480 2238180 2312786 2334102 2387392 2477985 2534560 2557920 2643184 2723119 2984240 3041472 3112136 3303980 3469179 3581088 3801840 3890170 3964776 4476360 4625572 4668204 4955970 5069120 5115840 5286368 5446238 5781965 5835255 5968480 6224272 6607960 6938358 7162176 7603680 7780340 7929552 8169357 8952720 9251144 9336408 9911940 10572736 10892476 11563930 11670510 11936960 12059527 12448544 13215920 13615595 13876716 15207360 15560680 15859104 16338714 17345895 17905440 18502288 18672816 19823880 21784952 23127860 23341020 24119054 24897088 26431840 27231190 27753432 31121360 31718208 32677428 34691790 35810880 36178581 37004576 37345632 39647760 40846785 43569904 46255720 46682040 48238108 52863680 54462380 55506864 60297635 62242720 65354856 69383580 72357162 74009152 74691264 79295520 81693570 84416689 87139808 92511440 93364080 96476216 108924760 111013728 120595270 124485440 130709712 138767160 144714324 158591040 163387140 168833378 174279616 180892905 185022880 186728160 192952432 217849520 222027456 241190540 253250067 261419424 277534320 289428648 326774280 337666756 361785810 370045760 373456320 385904864 422083445 435699040 482381080 506500134 522838848 555068640 578857296 653548560 675333512 723571620 771809728 844166890 871398080 964762160 1013000268 1110137280 1157714592 1266250335 1307097120 1350667024 1447143240 1688333780 1929524320 2026000536 2315429184 2532500670 2614194240 2701334048 2894286480 3376667560 3859048640 4052001072 5065001340 5402668096 5788572960 6753335120 8104002144 10130002680 11577145920 13506670240 16208004288 20260005360 27013340480 40520010720 81040021440
• Sum of all divisors σ(n): 307761192960
• Sum of proper divisors (its aliquot sum) s(n): 226721171520
• 81040021440 is an abundant number, because the sum of its proper divisors (226721171520) is greater than itself. Its abundance is 145681150080

Bases of 81040021440

• Binary: 1001011011110010111001001011111000000₂
• Hexadecimal: 0x12DE5C97C0
• Base-36: 11894WQO

Squares and roots of 81040021440

• 81040021440 squared (81040021440²) is 6567485074995659673600
• 81040021440 cubed (81040021440³) is 532229131284528267855487401984000
• The square root of 81040021440 is 284675.2912354705
• The cube root of 81040021440 is 4327.4611973515

Scales and comparisons

• 81,040,021,440 seconds is equal to 2,576 years, 42 weeks, 5 days, 5 hours, 4 minutes.
• To count from 1 to 81,040,021,440 would take you about five thousand, one hundred fifty-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 81040021440 cubic inches would be around 360.6 feet tall.

Recreational maths with 81040021440

• 81040021440 backwards is 04412004018
• 81040021440 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81040021440's digits is 24
• More coming soon!