81129872 (number)

81129872 is an even 8-digits composite number following 81129871 and preceding 81129873. In scientific notation, it is written as 8.1129872 × 10^7. The sum of its digits is 38. It has a total of 6 prime factors and 20 positive divisors. There are 40254240 positive integers (up to 81129872) that are relatively prime to 81129872.

Interesting facts

Basic properties

Name

Name eighty-one million one hundred twenty-nine thousand eight hundred seventy-two

Notation

Scientific notation 8.1129872 × 10^7
Engineering notation 8.1129872 × 10^6

Prime Factorization of 81129872

Prime Factorization 2 × 2 × 2 × 2 × 131 × 38707

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 6
Total number of prime factors
rad Radical 10141234
Product of the distinct prime numbers

The prime factorization of 81129872 is 2 × 2 × 2 × 2 × 131 × 38707. Since it has a total of 6 prime factors.

Most popular turbo-numbers

5, 9, 14, 11, 837, 72, 7673, 5643, 59390, 64291, 412175, 628971, 2466322, 9637895, 69539207, 6030307, 118902534, 678174381, 9136030904, 7485275440

Basic calculations (n = 81129872)

Multiplication

n×y
n×2 162259744
n×3 243389616
n×4 324519488
n×5 405649360

Division

n÷y
n÷2 40564936
n÷3 27043290.666667
n÷3 20282468
n÷5 16225974.4

Exponentiation

ny
n2 6582056130736384
n3 5.3400137138346E+23
n4 4.3323462908164E+31
n5 3.5148270003361E+39

Nth Root

y√n
2√n 9007.2122213258
3√n 432.9059918553
4√n 94.906333936812
5√n 38.180020580302

Divisors of 81129872

1, 2, 4, 8, 16, 131, 262, 524, 1048, 2096, 38707, 77414, 154828, 309656, 619312, 5070617, 10141234, 20282468, 40564936, 81129872

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 -81129871
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 81129872 can be divided by 20 positive divisors. The sum of these divisors (counting 81129872) is 1, the average is 0.05.

Base conversion 81129872

Base System Value
2 Binary 100110101011111000110010000
3 Ternary 12122122211021002
4 Quaternary 10311133012100
5 Quinary 131232123442
6 Senary 12014521132
8 Octal 465370620
10 Decimal 81129872
12 Duodecimal 232061a8
16 Hexadecimal 4d5f190
20 Vigesimal 15714dc
36 Base36 1caw7k

Cryptographic Hash Functions

md5 9fd18ab90d9fbcc7709712e2c7944d45
sha1 a73f1a039c35fb42b618a32a7e4aea96bcceb5bc
sha256 8fd3bad5bef9e5fb6090a35d7b28fbd6d2f462a36173aa145879b780f8c231de
sha512 6d2ada9f8a3b6a8ccad3a2e669f0e6b21bb8ae4c1628ee08754be89d96e7c37e7b86d890b1fe3d5a436623ce59124c997b1cd0996926c2a2afd62e62c283e8bb
ripemd-160 6c6ffddee59f7d93fd4b6ad111a04eba7e8cdfdc

81129872 as geometric shapes

Circle

Radius = n
Diameter 162259744
Circumference 509754019.72376
Area 2.0678139185837E+16

Sphere

Radius = n
Volume 2.2368197137935E+24
Surface area 8.2712556743348E+16
Circumference 509754019.72376

Square

Length = n
Perimeter 324519488
Area 6582056130736384
Diagonal 114734965.29599

Cube

Length = n
Surface area 39492336784418304
Volume 5.3400137138346E+23
Space diagonal 140521060.31556

Equilateral Triangle

Length = n
Perimeter 243389616
Area 2.8501139091764E+15
Altitude 70260530.15778

Triangular Pyramid

Length = n
Surface area 2.8501139091764E+15
Volume 6.2932665144693E+22
Height 38244988.431998