Properties of the Number 28431

Twenty-Eight Thousand Four Hundred Thirty-One

Basics

Value: 28430 → 28431 → 28432

Parity: odd

Prime: No

Previous Prime: 28429

Next Prime: 28433

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ⁷ × 13

Divisors: 1, 3, 9, 13, 27, 39, 81, 117, 243, 351

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110111100001111

Octal: 67417

Duodecimal: 14553

Hexadecimal: 6f0f

Square: 808321761

Square Root: 168.61494595675674

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Numbers of the form (3ⁱ)*(13^j). A107364

a(n) = 3ⁿ*tribonacci(n) or (3ⁿ)*A001644(n+1). A127215

a(n) = (n/4)*3^n/2*((1+sqrt(3))²+(-1)ⁿ*(1-sqrt(3))²). A187273

a(n) = 3·a(n-1) - 6·a(n-2), with a(0)=0, a(1)=1. A190960

Numbers that are sums of consecutive powers of 3. A309758

Odd numbers divisible by exactly 8 primes (counted with multiplicity). A46321

Partial sums of n 3-spaced triangular numbers beginning with t(3), e.g., a(2) = t(3)+t(6) = 6+21 = 27. A85788

Sequence is identical to its third differences in absolute value: a(0), a(1), a(2), a(2n+1)=3a(2n)-3a(2n-1)+2a(2n-2), a(2n+2)=3a(2n+1)-3a(2n), with a(0)=a(1)=0, a(2)=1. A131665

Expansion of (1+27x²-54x³)/((1+3x)²*(1-3x+9 x²)). A168075

Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of f(i,j)=min(3i-2,3j-2) (A204028). A204029