81000400
81,000,400 is an even composite number composed of five prime numbers multiplied together.
81000400 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 81000400:
24 × 52 × 13 × 37 × 421
(2 × 2 × 2 × 2 × 5 × 5 × 13 × 37 × 421)See below for interesting mathematical facts about the number 81000400 from the Numbermatics database.
Names of 81000400
- Cardinal: 81000400 can be written as Eighty-one million, four hundred.
Scientific notation
- Scientific notation: 8.10004 × 107
Factors of 81000400
Divisors of 81000400
- Number of divisors d(n): 120
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Complete list of divisors:
1 2 4 5 8 10 13 16 20 25 26 37 40 50 52 65 74 80 100 104 130 148 185 200 208 260 296 325 370 400 421 481 520 592 650 740 842 925 962 1040 1300 1480 1684 1850 1924 2105 2405 2600 2960 3368 3700 3848 4210 4810 5200 5473 6736 7400 7696 8420 9620 10525 10946 12025 14800 15577 16840 19240 21050 21892 24050 27365 31154 33680 38480 42100 43784 48100 54730 62308 77885 84200 87568 96200 109460 124616 136825 155770 168400 192400 202501 218920 249232 273650 311540 389425 405002 437840 547300 623080 778850 810004 1012505 1094600 1246160 1557700 1620008 2025010 2189200 3115400 3240016 4050020 5062525 6230800 8100040 10125050 16200080 20250100 40500200 81000400
- Sum of all divisors σ(n): 215748344
- Sum of proper divisors (its aliquot sum) s(n): 134747944
- 81000400 is an abundant number, because the sum of its proper divisors (134747944) is greater than itself. Its abundance is 53747544
Bases of 81000400
- Binary: 1001101001111110111110100002
- Hexadecimal: 0x4D3F7D0
- Base-36: 1C84B4
Squares and roots of 81000400
- 81000400 squared (810004002) is 6561064800160000
- 81000400 cubed (810004003) is 531448873238880064000000
-
The
square root of 81000400 is 9000.0222221947 -
The
cube root of 81000400 is 432.6755833131
Scales and comparisons
How big is 81000400?- 81,000,400 seconds is equal to 2 years, 29 weeks, 6 days, 12 hours, 6 minutes, 40 seconds.
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To count from 1 to 81,000,400 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 81000400 cubic inches would be around 36.1 feet tall.
Recreational maths with 81000400
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