81640000

Names of 81640000

• Cardinal: 81640000 can be written as Eighty-one million, six hundred forty thousand.

Scientific notation

• Scientific notation: 8.164 × 10⁷

Factors of 81640000

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 177

Divisors of 81640000

• Number of divisors d(n): 140
• Complete list of divisors:
  1 2 4 5 8 10 13 16 20 25 26 32 40 50 52 64 65 80 100 104 125 130 157 160 200 208 250 260 314 320 325 400 416 500 520 625 628 650 785 800 832 1000 1040 1250 1256 1300 1570 1600 1625 2000 2041 2080 2500 2512 2600 3140 3250 3925 4000 4082 4160 5000 5024 5200 6280 6500 7850 8000 8125 8164 10000 10048 10205 10400 12560 13000 15700 16250 16328 19625 20000 20410 20800 25120 26000 31400 32500 32656 39250 40000 40820 50240 51025 52000 62800 65000 65312 78500 81640 98125 102050 104000 125600 130000 130624 157000 163280 196250 204100 251200 255125 260000 314000 326560 392500 408200 510250 520000 628000 653120 785000 816400 1020500 1256000 1275625 1570000 1632800 2041000 2551250 3140000 3265600 4082000 5102500 6280000 8164000 10205000 16328000 20410000 40820000 81640000
• Sum of all divisors σ(n): 219401644
• Sum of proper divisors (its aliquot sum) s(n): 137761644
• 81640000 is an abundant number, because the sum of its proper divisors (137761644) is greater than itself. Its abundance is 56121644

Bases of 81640000

• Binary: 100110111011011101001000000₂
• Hexadecimal: 0x4DDBA40
• Base-36: 1CLTTS

Squares and roots of 81640000

• 81640000 squared (81640000²) is 6665089600000000
• 81640000 cubed (81640000³) is 544137914944000000000000
• The square root of 81640000 is 9035.4855984613
• The cube root of 81640000 is 433.8114381161

Scales and comparisons

• 81,640,000 seconds is equal to 2 years, 30 weeks, 6 days, 21 hours, 46 minutes, 40 seconds.
• To count from 1 to 81,640,000 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 81640000 cubic inches would be around 36.2 feet tall.

Recreational maths with 81640000

• 81640000 backwards is 00004618
• The number of decimal digits it has is: 8
• The sum of 81640000's digits is 19
• More coming soon!