81681520 (number)

81681520 is an even 8-digits composite number following 81681519 and preceding 81681521. In scientific notation, it is written as 8.1681520 × 10^7. The sum of its digits is 31. It has a total of 6 prime factors and 20 positive divisors. There are 32672576 positive integers (up to 81681520) that are relatively prime to 81681520.

Interesting facts

Basic properties

Name

Name eighty-one million six hundred eighty-one thousand five hundred twenty

Notation

Scientific notation 8.1681520 × 10^7
Engineering notation 8.1681520 × 10^6

Prime Factorization of 81681520

Prime Factorization 2 × 2 × 2 × 2 × 5 × 1021019

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 6
Total number of prime factors
rad Radical 10210190
Product of the distinct prime numbers

The prime factorization of 81681520 is 2 × 2 × 2 × 2 × 5 × 1021019. Since it has a total of 6 prime factors.

Most popular turbo-numbers

10, 4, 48, 81, 523, 1000, 3685, 7507, 11190, 85058, 961532, 317654, 1317932, 5218255, 11948390, 33424601, 381809086, 688687128, 8555418273, 9798690171

Basic calculations (n = 81681520)

Multiplication

n×y
n×2 163363040
n×3 245044560
n×4 326726080
n×5 408407600

Division

n÷y
n÷2 40840760
n÷3 27227173.333333
n÷3 20420380
n÷5 16336304

Exponentiation

ny
n2 6671870709510400
n3 5.4496854079629E+23
n4 4.4513858764423E+31
n5 3.6359596449434E+39

Nth Root

y√n
2√n 9037.7829139673
3√n 433.88496742483
4√n 95.067254688286
5√n 38.231801457724

Divisors of 81681520

1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1021019, 2042038, 4084076, 5105095, 8168152, 10210190, 16336304, 20420380, 40840760, 81681520

20 divisors

τ Total Divisors 20
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81681519
Sum of the proper positive divisors of n
A Arithmetic Mean 0.05
Returns the sum of divisors (σ(n)) divided by the total number of divisors (τ(n))
G Geometric Mean 1
Returns the nth root of the product of n divisors
H Harmonic Mean 20
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81681520 can be divided by 20 positive divisors. The sum of these divisors (counting 81681520) is 1, the average is 0.05.

Base conversion 81681520

Base System Value
2 Binary 100110111100101110001110000
3 Ternary 12200200211222111
4 Quaternary 10313211301300
5 Quinary 131402302040
6 Senary 12034415104
8 Octal 467456160
10 Decimal 81681520
12 Duodecimal 23431494
16 Hexadecimal 4de5c70
20 Vigesimal 15aa3g0
36 Base36 1cmpv4

Cryptographic Hash Functions

md5 fdd6d447e26ddffe52aeb3716d877d39
sha1 f39ce5e3e78a5444f3fa208f3af19b0764feb21f
sha256 353bab0f0f49fca56d0480d3dad7db6648125dd85a25ed7c01cb04898284d66a
sha512 e279e1b7ab7324477cb5ca25a28cf28eb3b3ce492db85012e6a0ea02231d389f0d6cb37165a98be973afd95460eca62f1152ebaaaf2c39269efdb3082d56e39b
ripemd-160 98b7c5cd632cb6c9d4f1dcf60e7291b2e0179304

81681520 as geometric shapes

Circle

Radius = n
Diameter 163363040
Circumference 513220126.3321
Area 2.0960300006699E+16

Sphere

Radius = n
Volume 2.2827588856042E+24
Surface area 8.3841200026795E+16
Circumference 513220126.3321

Square

Length = n
Perimeter 326726080
Area 6671870709510400
Diagonal 115515113.37925

Cube

Length = n
Surface area 40031224257062400
Volume 5.4496854079629E+23
Space diagonal 141476542.67945

Equilateral Triangle

Length = n
Perimeter 245044560
Area 2.8890047626007E+15
Altitude 70738271.339727

Triangular Pyramid

Length = n
Surface area 2.8890047626007E+15
Volume 6.4225158455065E+22
Height 38505037.793083