81688390

81,688,390 is an even composite number composed of five prime numbers multiplied together.

What does the number 81688390 look like?

This visualization shows the relationship between its 5 prime factors (large circles) and 48 divisors.

81688390 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of forty-eight divisors.

Prime factorization of 81688390:

2 × 5 × 7² × 43 × 3877

(2 × 5 × 7 × 7 × 43 × 3877)

See below for interesting mathematical facts about the number 81688390 from the Numbermatics database.

Names of 81688390

Cardinal: 81688390 can be written as Eighty-one million, six hundred eighty-eight thousand, three hundred ninety.

Scientific notation

Scientific notation: 8.168839 × 10⁷

Factors of 81688390

Number of distinct prime factors ω(n): 5
Total number of prime factors Ω(n): 6
Sum of prime factors: 3934

Divisors of 81688390

Number of divisors d(n): 48
Complete list of divisors:
1 2 5 7 10 14 35 43 49 70 86 98 215 245 301 430 490 602 1505 2107 3010 3877 4214 7754 10535 19385 21070 27139 38770 54278 135695 166711 189973 271390 333422 379946 833555 949865 1166977 1667110 1899730 2333954 5834885 8168839 11669770 16337678 40844195 81688390
Sum of all divisors σ(n): 175068432
Sum of proper divisors (its aliquot sum) s(n): 93380042
81688390 is an abundant number, because the sum of its proper divisors (93380042) is greater than itself. Its abundance is 11691652

Bases of 81688390

Binary: 100110111100111011101000110₂
Hexadecimal: 0x4DE7746
Base-36: 1CMV5Y

Squares and roots of 81688390

81688390 squared (81688390²) is 6672993060792100
81688390 cubed (81688390³) is 545106059617278773719000
The square root of 81688390 is 9038.1629770657
The cube root of 81688390 is 433.8971313601

Scales and comparisons

How big is 81688390?

81,688,390 seconds is equal to 2 years, 31 weeks, 11 hours, 13 minutes, 10 seconds.
To count from 1 to 81,688,390 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 81688390 cubic inches would be around 36.2 feet tall.

Recreational maths with 81688390

81688390 backwards is 09388618
81688390 is a Harshad number.
The number of decimal digits it has is: 8
The sum of 81688390's digits is 43
More coming soon!

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The information we have on file for 81688390 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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