81380490840

Names of 81380490840

• Cardinal: 81380490840 can be written as Eighty-one billion, three hundred eighty million, four hundred ninety thousand, eight hundred forty.

Scientific notation

• Scientific notation: 8.138049084 × 10¹⁰

Factors of 81380490840

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 1868260

Divisors of 81380490840

• Number of divisors d(n): 144
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 11 12 15 18 20 22 24 30 33 36 40 44 45 55 60 66 72 88 90 99 110 120 121 132 165 180 198 220 242 264 330 360 363 396 440 484 495 605 660 726 792 968 990 1089 1210 1320 1452 1815 1980 2178 2420 2904 3630 3960 4356 4840 5445 7260 8712 10890 14520 21780 43560 1868239 3736478 5604717 7472956 9341195 11209434 14945912 16814151 18682390 20550629 22418868 28023585 33628302 37364780 41101258 44837736 56047170 61651887 67256604 74729560 82202516 84070755 102753145 112094340 123303774 134513208 164405032 168141510 184955661 205506290 224188680 226056919 246607548 308259435 336283020 369911322 411012580 452113838 493215096 616518870 672566040 678170757 739822644 822025160 904227676 924778305 1130284595 1233037740 1356341514 1479645288 1808455352 1849556610 2034512271 2260569190 2466075480 2712683028 3390853785 3699113220 4069024542 4521138380 5425366056 6781707570 7398226440 8138049084 9042276760 10172561355 13563415140 16276098168 20345122710 27126830280 40690245420 81380490840
• Sum of all divisors σ(n): 290716826400
• Sum of proper divisors (its aliquot sum) s(n): 209336335560
• 81380490840 is an abundant number, because the sum of its proper divisors (209336335560) is greater than itself. Its abundance is 127955844720

Bases of 81380490840

• Binary: 1001011110010101001111011111001011000₂
• Hexadecimal: 0x12F2A7BE58
• Base-36: 11DVUCM0

Squares and roots of 81380490840

• 81380490840 squared (81380490840²) is 6622784289359323905600
• 81380490840 cubed (81380490840³) is 538965436195502368568273824704000
• The square root of 81380490840 is 285272.6605197211
• The cube root of 81380490840 is 4333.5129791929

Scales and comparisons

• 81,380,490,840 seconds is equal to 2,587 years, 33 weeks, 4 days, 19 hours, 54 minutes.
• To count from 1 to 81,380,490,840 would take you about five thousand, one hundred seventy-five 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 81380490840 cubic inches would be around 361.1 feet tall.

Recreational maths with 81380490840

• 81380490840 backwards is 04809408318
• 81380490840 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81380490840's digits is 45
• More coming soon!