81721856 (number)

81721856 is an even 8-digits composite number following 81721855 and preceding 81721857. In scientific notation, it is written as 8.1721856 × 10^7. The sum of its digits is 38. It has a total of 12 prime factors and 80 positive divisors. There are 37355520 positive integers (up to 81721856) that are relatively prime to 81721856.

Interesting facts

Basic properties

Name

Name eighty-one million seven hundred twenty-one thousand eight hundred fifty-six

Notation

Scientific notation 8.1721856 × 10^7
Engineering notation 8.1721856 × 10^6

Prime Factorization of 81721856

Prime Factorization 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 17 × 41 × 229

Composite number
ω Distinct Factors 4
Total number of distinct prime factors
Ω Total Factors 12
Total number of prime factors
rad Radical 319226
Product of the distinct prime numbers

The prime factorization of 81721856 is 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 17 × 41 × 229. Since it has a total of 12 prime factors.

Most popular turbo-numbers

8, 4, 50, 24, 98, 221, 6675, 3399, 8847, 85864, 725806, 191704, 5349446, 3155817, 22445661, 82294048, 851454970, 389672580, 1097211030, 6349015149

Basic calculations (n = 81721856)

Multiplication

n×y
n×2 163443712
n×3 245165568
n×4 326887424
n×5 408609280

Division

n÷y
n÷2 40860928
n÷3 27240618.666667
n÷3 20430464
n÷5 16344371.2

Exponentiation

ny
n2 6678461748084736
n3 5.4577628927849E+23
n4 4.4601851320631E+31
n5 3.644946070958E+39

Nth Root

y√n
2√n 9040.0141592809
3√n 433.95637608627
4√n 95.078989052687
5√n 38.235576640709

Divisors of 81721856

1, 2, 4, 8, 16, 17, 32, 34, 41, 64, 68, 82, 128, 136, 164, 229, 256, 272, 328, 458, 512, 544, 656, 697, 916, 1088, 1312, 1394, 1832, 2176, 2624, 2788, 3664, 3893, 4352, 5248, 5576, 7328, 7786, 8704, 9389, 10496, 11152, 14656, 15572, 18778, 20992, 22304, 29312, 31144, 37556, 44608, 58624, 62288, 75112, 89216, 117248, 124576, 150224, 159613, 178432, 249152, 300448, 319226, 356864, 498304, 600896, 638452, 996608, 1201792, 1276904, 1993216, 2403584, 2553808, 4807168, 5107616, 10215232, 20430464, 40860928, 81721856

80 divisors

τ Total Divisors 80
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81721855
Sum of the proper positive divisors of n
A Arithmetic Mean 0.0125
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 80
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81721856 can be divided by 80 positive divisors. The sum of these divisors (counting 81721856) is 1, the average is 0.0125.

Base conversion 81721856

Base System Value
2 Binary 100110111101111101000000000
3 Ternary 12200202220022102
4 Quaternary 10313233220000
5 Quinary 131410044411
6 Senary 12035325532
8 Octal 467575000
10 Decimal 81721856
12 Duodecimal 234508a8
16 Hexadecimal 4defa00
20 Vigesimal 15af4cg
36 Base36 1cnkzk

Cryptographic Hash Functions

md5 728efdc969cece0ba6c51e08b91a1e92
sha1 6adee23c474375163b40e6d2799b0d811124bb13
sha256 badc4393d301530bca95edebbd8f94bfa2010a73981933bd5c01afea67d36d58
sha512 856661a85aebdbf6c93c1f47baf3b333e17debc1b5b7eb7ab68018e17e0464cc741557f02e7c9ce45f8c20a4fa22e389d182ac6830a823583245030b76280c62
ripemd-160 a4e6f536b9fe671c840428c9f553396ed53c8c8f

81721856 as geometric shapes

Circle

Radius = n
Diameter 163443712
Circumference 513473564.89465
Area 2.0981006365063E+16

Sphere

Radius = n
Volume 2.2861423745344E+24
Surface area 8.3924025460254E+16
Circumference 513473564.89465

Square

Length = n
Perimeter 326887424
Area 6678461748084736
Diagonal 115572157.0975

Cube

Length = n
Surface area 40070770488508416
Volume 5.4577628927849E+23
Space diagonal 141546406.68083

Equilateral Triangle

Length = n
Perimeter 245165568
Area 2.891858766022E+15
Altitude 70773203.340414

Triangular Pyramid

Length = n
Surface area 2.891858766022E+15
Volume 6.4320352526608E+22
Height 38524052.365834