81042500
81,042,500 is an even composite number composed of five prime numbers multiplied together.
81042500 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred twenty divisors.
Prime factorization of 81042500:
22 × 54 × 7 × 11 × 421
(2 × 2 × 5 × 5 × 5 × 5 × 7 × 11 × 421)See below for interesting mathematical facts about the number 81042500 from the Numbermatics database.
Names of 81042500
- Cardinal: 81042500 can be written as Eighty-one million, forty-two thousand, five hundred.
Scientific notation
- Scientific notation: 8.10425 × 107
Factors of 81042500
Divisors of 81042500
- Number of divisors d(n): 120
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Complete list of divisors:
1 2 4 5 7 10 11 14 20 22 25 28 35 44 50 55 70 77 100 110 125 140 154 175 220 250 275 308 350 385 421 500 550 625 700 770 842 875 1100 1250 1375 1540 1684 1750 1925 2105 2500 2750 2947 3500 3850 4210 4375 4631 5500 5894 6875 7700 8420 8750 9262 9625 10525 11788 13750 14735 17500 18524 19250 21050 23155 27500 29470 32417 38500 42100 46310 48125 52625 58940 64834 73675 92620 96250 105250 115775 129668 147350 162085 192500 210500 231550 263125 294700 324170 368375 463100 526250 578875 648340 736750 810425 1052500 1157750 1473500 1620850 1841875 2315500 2894375 3241700 3683750 4052125 5788750 7367500 8104250 11577500 16208500 20260625 40521250 81042500
- Sum of all divisors σ(n): 221479104
- Sum of proper divisors (its aliquot sum) s(n): 140436604
- 81042500 is an abundant number, because the sum of its proper divisors (140436604) is greater than itself. Its abundance is 59394104
Bases of 81042500
- Binary: 1001101010010011100010001002
- Hexadecimal: 0x4D49C44
- Base-36: 1C90SK
Squares and roots of 81042500
- 81042500 squared (810425002) is 6567886806250000
- 81042500 cubed (810425003) is 532277966495515625000000
-
The
square root of 81042500 is 9002.3608014787 -
The
cube root of 81042500 is 432.7505314495
Scales and comparisons
How big is 81042500?- 81,042,500 seconds is equal to 2 years, 29 weeks, 6 days, 23 hours, 48 minutes, 20 seconds.
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To count from 1 to 81,042,500 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 81042500 cubic inches would be around 36.1 feet tall.
Recreational maths with 81042500
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