Properties of the Number 81648

Eighty-One Thousand Six Hundred Forty-Eight

Basics

Value: 81647 → 81648 → 81649

Parity: even

Prime: No

Previous Prime: 81647

Next Prime: 81649

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ⁶ × 7

Divisors: 1, 2, 3, 4, 6, 7, 8, 9, 12, 14

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111011110000

Octal: 237360

Duodecimal: 3B300

Hexadecimal: 13ef0

Square: 6666395904

Square Root: 285.7411415949758

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

Triangle read by rows: terms T(n,k) of a binomial decomposition of n*(n-1) as Sum(k=0..n)T(n,k). A244139

Number n such that Fibonacci(n) is divisible by n, n + 1 and n - 1. A221018

Triangle of coefficients in expansion of (2+3x)ⁿ. A13620

Triangle whose (i,j)-th entry is binomial(i,j)*3^i-j*2^j. A38220

Triangle read by rows: T(0,0) = 1; T(n,k) = 3·T(n-1,k) - 2·T(n-2,k-1) for k = 0..floor(n/2); T(n,k)=0 for n or k < 0. Triangle of coefficients of Fermat polynomials. A303941

Averages of twin prime pairs k such that k·7 and k/7 are squares. A154673

Triangle read by rows of coefficients in expansion of (3-2x)ⁿ, where n is a nonnegative integer. A303901

Number of ways to form k labeled groups, each with a distinct leader, using n people. Triangle T(n,k) = n!*k^n-k/(n-k)! for 1 <= k <= n. A199673

Smallest number having at least n divisors and a prime power as n-th divisor. A119311

Triangle, read by rows, where T(n,k) = k!*C(n, k)*3^n-k for n>=0, k=0..n. A217629