81397987 (number)

81397987 is an odd 8-digits composite number following 81397986 and preceding 81397988. In scientific notation, it is written as 8.1397987 × 10^7. The sum of its digits is 52. It has a total of 2 prime factors and 4 positive divisors. There are 73998160 positive integers (up to 81397987) that are relatively prime to 81397987.

Interesting facts

Basic properties

Name

Name eighty-one million three hundred ninety-seven thousand nine hundred eighty-seven

Notation

Scientific notation 8.1397987 × 10^7
Engineering notation 8.1397987 × 10^6

Prime Factorization of 81397987

Prime Factorization 11 × 7399817

Composite number
ω Distinct Factors 2
Total number of distinct prime factors
Ω Total Factors 2
Total number of prime factors
rad Radical 81397987
Product of the distinct prime numbers

The prime factorization of 81397987 is 11 × 7399817. Since it has a total of 2 prime factors.

Most popular turbo-numbers

10, 4, 31, 70, 650, 914, 4648, 8372, 13947, 38822, 66089, 493911, 4180945, 5960379, 98994120, 31492423, 234876779, 658665295, 451416708, 8294577805

Basic calculations (n = 81397987)

Multiplication

n×y
n×2 162795974
n×3 244193961
n×4 325591948
n×5 406989935

Division

n÷y
n÷2 40698993.5
n÷3 27132662.333333
n÷3 20349496.75
n÷5 16279597.4

Exponentiation

ny
n2 6625632287652169
n3 5.3931313081709E+23
n4 4.3899003211179E+31
n5 3.5732904926965E+39

Nth Root

y√n
2√n 9022.0832960021
3√n 433.38235139116
4√n 94.984647685834
5√n 38.205222471722

Divisors of 81397987

1, 11, 7399817, 81397987

4 divisors

τ Total Divisors 4
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81397986
Sum of the proper positive divisors of n
A Arithmetic Mean 0.25
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 4
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81397987 can be divided by 4 positive divisors. The sum of these divisors (counting 81397987) is 1, the average is 0.25.

Base conversion 81397987

Base System Value
2 Binary 100110110100000100011100011
3 Ternary 12200011110001021
4 Quaternary 10312200203203
5 Quinary 131314213422
6 Senary 12024350311
8 Octal 466404343
10 Decimal 81397987
12 Duodecimal 23315397
16 Hexadecimal 4da08e3
20 Vigesimal 158eej7
36 Base36 1cgn37

Cryptographic Hash Functions

md5 4c232c186f97a58c88dea568ec8f094f
sha1 e46f207fc8ea805beaad8dc26ecaa16c5210262b
sha256 606d99f53a78cebfc21a4e117191d0a37fcfd8329b92e5bd323ad3f929162bac
sha512 b0f630296b771ab212126989baa6f465f201219c3b80bd98f8f956410151ac99df6aff7250278ddb234294db47d126fcd341a0db96d1e4bb9bad8425682f35e8
ripemd-160 8717cc0f0a362a01887c4409edb93739d190a7c9

81397987 as geometric shapes

Circle

Radius = n
Diameter 162795974
Circumference 511438635.95239
Area 2.0815037720275E+16

Sphere

Radius = n
Volume 2.2590695596793E+24
Surface area 8.3260150881102E+16
Circumference 511438635.95239

Square

Length = n
Perimeter 325591948
Area 6625632287652169
Diagonal 115114137.16527

Cube

Length = n
Surface area 39753793725913014
Volume 5.3931313081709E+23
Space diagonal 140985449.11783

Equilateral Triangle

Length = n
Perimeter 244193961
Area 2.8689829386206E+15
Altitude 70492724.558915

Triangular Pyramid

Length = n
Surface area 2.8689829386206E+15
Volume 6.3558661997286E+22
Height 38371379.05509