81683140

Names of 81683140

• Cardinal: 81683140 can be written as Eighty-one million, six hundred eighty-three thousand, one hundred forty.

Scientific notation

• Scientific notation: 8.168314 × 10⁷

Factors of 81683140

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 144

Divisors of 81683140

• Number of divisors d(n): 192
• Complete list of divisors:
  1 2 4 5 7 10 11 14 20 22 28 29 31 35 44 55 58 59 62 70 77 110 116 118 124 140 145 154 155 203 217 220 236 290 295 308 310 319 341 385 406 413 434 580 590 620 638 649 682 770 812 826 868 899 1015 1085 1180 1276 1298 1364 1540 1595 1652 1705 1711 1798 1829 2030 2065 2170 2233 2387 2596 3190 3245 3410 3422 3596 3658 4060 4130 4340 4466 4495 4543 4774 6293 6380 6490 6820 6844 7316 8260 8555 8932 8990 9086 9145 9548 9889 11165 11935 11977 12586 12803 12980 17110 17980 18172 18290 18821 19778 20119 22330 22715 23870 23954 25172 25606 31465 34220 36580 37642 39556 40238 44660 45430 47740 47908 49445 51212 53041 59885 62930 64015 69223 75284 80476 90860 94105 98890 100595 106082 119770 125860 128030 131747 138446 140833 188210 197780 201190 212164 239540 256060 263494 265205 276892 281666 346115 371287 376420 402380 526988 530410 563332 583451 658735 692230 704165 742574 1060820 1166902 1317470 1384460 1408330 1485148 1856435 2333804 2634940 2816660 2917255 3712870 4084157 5834510 7425740 8168314 11669020 16336628 20420785 40841570 81683140
• Sum of all divisors σ(n): 232243200
• Sum of proper divisors (its aliquot sum) s(n): 150560060
• 81683140 is an abundant number, because the sum of its proper divisors (150560060) is greater than itself. Its abundance is 68876920

Bases of 81683140

• Binary: 100110111100110001011000100₂
• Hexadecimal: 0x4DE62C4
• Base-36: 1CMR44

Squares and roots of 81683140

• 81683140 squared (81683140²) is 6672135360259600
• 81683140 cubed (81683140³) is 545000966731035343144000
• The square root of 81683140 is 9037.8725372733
• The cube root of 81683140 is 433.8878358377

Scales and comparisons

• 81,683,140 seconds is equal to 2 years, 31 weeks, 9 hours, 45 minutes, 40 seconds.
• To count from 1 to 81,683,140 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 81683140 cubic inches would be around 36.2 feet tall.

Recreational maths with 81683140

• 81683140 backwards is 04138618
• 81683140 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 81683140's digits is 31
• More coming soon!