81487890 (number)

81487890 is an even 8-digits composite number following 81487889 and preceding 81487891. In scientific notation, it is written as 8.1487890 × 10^7. The sum of its digits is 45. It has a total of 5 prime factors and 32 positive divisors. There are 19753920 positive integers (up to 81487890) that are relatively prime to 81487890.

Interesting facts

Basic properties

Name

Name eighty-one million four hundred eighty-seven thousand eight hundred ninety

Notation

Scientific notation 8.1487890 × 10^7
Engineering notation 8.1487890 × 10^6

Prime Factorization of 81487890

Prime Factorization 2 × 15 × 9 × 11 × 27437

Composite number
ω Distinct Factors 5
Total number of distinct prime factors
Ω Total Factors 5
Total number of prime factors
rad Radical 81487890
Product of the distinct prime numbers

The prime factorization of 81487890 is 2 × 15 × 9 × 11 × 27437. Since it has a total of 5 prime factors.

Most popular turbo-numbers

2, 3, 18, 86, 900, 789, 6219, 7502, 80435, 27905, 411657, 171682, 1058396, 1986190, 15321550, 30426080, 321266169, 186089796, 1204383064, 6592575453

Basic calculations (n = 81487890)

Multiplication

n×y
n×2 162975780
n×3 244463670
n×4 325951560
n×5 407439450

Division

n÷y
n÷2 40743945
n÷3 27162630
n÷3 20371972.5
n÷5 16297578

Exponentiation

ny
n2 6640276216652100
n3 5.4110209791216E+23
n4 4.4093268233436E+31
n5 3.5930673915467E+39

Nth Root

y√n
2√n 9027.0643068497
3√n 433.54184770998
4√n 95.010864151684
5√n 38.213658178271

Divisors of 81487890

1, 2, 9, 11, 15, 18, 22, 30, 99, 135, 165, 198, 270, 330, 1485, 2970, 27437, 54874, 246933, 301807, 411555, 493866, 603614, 823110, 2716263, 3703995, 4527105, 5432526, 7407990, 9054210, 40743945, 81487890

32 divisors

τ Total Divisors 32
Total number of the positive divisors of n
σ Sum of Divisors 1
Sum of all the positive divisors of n
s Aliquot Sum -81487889
Sum of the proper positive divisors of n
A Arithmetic Mean 0.03125
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 32
Returns the total number of divisors (τ(n)) divided by the sum of the reciprocal of each divisors

The number 81487890 can be divided by 32 positive divisors. The sum of these divisors (counting 81487890) is 1, the average is 0.03125.

Base conversion 81487890

Base System Value
2 Binary 100110110110110100000010010
3 Ternary 12200100000101000
4 Quaternary 10312312200102
5 Quinary 131330103030
6 Senary 12030322430
8 Octal 466664022
10 Decimal 81487890
12 Duodecimal 23359416
16 Hexadecimal 4db6812
20 Vigesimal 1595jea
36 Base36 1cikgi

Cryptographic Hash Functions

md5 7b1816d8fbec4c5867c77ab4882c09b1
sha1 0f98aa360e2b8060ce8dc169ce048542b5fa25b4
sha256 f69bee88b8698eb1de5cabe8bc38e8c6425bd02ce94aaeb8c411b9021c50241c
sha512 c08ef32ebe51cc39f17e2632cdd2f68999f31d5fd67b7ae84df9c44754432883bdc09eb1fdad13145ff16c63ec3324c84bf0a87fe7230ec587725463028e213d
ripemd-160 95a82d3553405857c6d21e89c0a3269b9302863b

81487890 as geometric shapes

Circle

Radius = n
Diameter 162975780
Circumference 512003513.16107
Area 2.0861042980041E+16

Sphere

Radius = n
Volume 2.2665631675238E+24
Surface area 8.3444171920165E+16
Circumference 512003513.16107

Square

Length = n
Perimeter 325951560
Area 6640276216652100
Diagonal 115241279.20717

Cube

Length = n
Surface area 39841657299912600
Volume 5.4110209791216E+23
Space diagonal 141141165.68158

Equilateral Triangle

Length = n
Perimeter 244463670
Area 2.8753239458832E+15
Altitude 70570582.840792

Triangular Pyramid

Length = n
Surface area 2.8753239458832E+15
Volume 6.3769493791326E+22
Height 38413759.735722