81091388 (number)

81091388 is an even 8-digits composite number following 81091387 and preceding 81091389. In scientific notation, it is written as 8.1091388 × 10^7. The sum of its digits is 38. It has a total of 4 prime factors and 12 positive divisors. There are 34753440 positive integers (up to 81091388) that are relatively prime to 81091388.

Interesting facts

Basic properties

Name

Name eighty-one million ninety-one thousand three hundred eighty-eight

Notation

Scientific notation 8.1091388 × 10^7
Engineering notation 8.1091388 × 10^6

Prime Factorization of 81091388

Prime Factorization 2 × 2 × 7 × 2896121

Composite number
ω Distinct Factors 3
Total number of distinct prime factors
Ω Total Factors 4
Total number of prime factors
rad Radical 40545694
Product of the distinct prime numbers

The prime factorization of 81091388 is 2 × 2 × 7 × 2896121. Since it has a total of 4 prime factors.

Most popular turbo-numbers

3, 6, 63, 93, 156, 817, 5256, 9073, 91296, 12792, 766609, 141093, 7574287, 4421674, 89903730, 21042760, 486537298, 595995919, 4337966602, 5221014134

Basic calculations (n = 81091388)

Multiplication

n×y
n×2 162182776
n×3 243274164
n×4 324365552
n×5 405456940

Division

n÷y
n÷2 40545694
n÷3 27030462.666667
n÷3 20272847
n÷5 16218277.6

Exponentiation

ny
n2 6575813207766544
n3 5.3324182024652E+23
n4 4.3241319343437E+31
n5 3.5064986045105E+39

Nth Root

y√n
2√n 9005.0756798597
3√n 432.83753129656
4√n 94.895077216153
5√n 38.176397750032

Divisors of 81091388

1, 2, 4, 7, 14, 28, 2896121, 5792242, 11584484, 20272847, 40545694, 81091388

12 divisors

τ Total Divisors 12
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81091387
Sum of the proper positive divisors of n
A Arithmetic Mean 0.083333333333333
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 12
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81091388 can be divided by 12 positive divisors. The sum of these divisors (counting 81091388) is 1, the average is 0.083333333333333.

Base conversion 81091388

Base System Value
2 Binary 100110101010101101100111100
3 Ternary 12122120212110202
4 Quaternary 10311111230330
5 Quinary 131224411023
6 Senary 12014023032
8 Octal 465255474
10 Decimal 81091388
12 Duodecimal 231a7a78
16 Hexadecimal 4d55b3c
20 Vigesimal 156g898
36 Base36 1ca2ik

Cryptographic Hash Functions

md5 d21f16f6cb5170959a65c43c8f7dcb60
sha1 72fe67365cb0586e19fc127462935d563d221ba0
sha256 1d14651b5de406157fa26a502828e07b7e99ecc49ab36914ee63a347fcbe5e34
sha512 6a39ed65551b21cef55583d7ed8268ab22eaa4268536da62002f2cfe6b97deb70fd813541e2335d8d90254b4040c3df1bd1a28ec7ef85bce016c4695714f76a8
ripemd-160 3fe6c02ed29841d08d9a8517d955598b9ed27de9

81091388 as geometric shapes

Circle

Radius = n
Diameter 162182776
Circumference 509512217.6204
Area 2.0658526464898E+16

Sphere

Radius = n
Volume 2.2336381134311E+24
Surface area 8.2634105859592E+16
Circumference 509512217.6204

Square

Length = n
Perimeter 324365552
Area 6575813207766544
Diagonal 114680540.70126

Cube

Length = n
Surface area 39454879246599264
Volume 5.3324182024652E+23
Space diagonal 140454404.07228

Equilateral Triangle

Length = n
Perimeter 243274164
Area 2.8474106442335E+15
Altitude 70227202.036141

Triangular Pyramid

Length = n
Surface area 2.8474106442335E+15
Volume 6.2843151184762E+22
Height 38226846.90042