Properties of the Number 87644

Eighty-Seven Thousand Six Hundred Forty-Four

Basics

Value: 87643 → 87644 → 87645

Parity: even

Prime: No

Previous Prime: 87643

Next Prime: 87649

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 21911

Divisors: 1, 2, 4, 21911, 43822, 87644

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10101011001011100

Octal: 253134

Duodecimal: 42878

Hexadecimal: 1565c

Square: 7681470736

Square Root: 296.04729351912675

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

Base-2 expansion of a(n) encodes the steps where numbers of the form 6k+5 are encountered when map x -> A252463(x) is iterated down to 1, starting from x=n. A292945

a(1) = 0; and for n > 1, a(n) = 2·a(A285712(n)) + [0 == (n mod 3)]. A292590

a(n) = A115004(2n)/4. A331760

T(n,k) = Number of squarefree words of length n in a (k+1)-ary alphabet, with new values 0..k introduced in increasing order. A215075

Triangle T(n,k) (n >= 2, 1 <= k <= n) read by rows: (1/2) times number of linearly inducible orderings of n points in k-dimensional Euclidean space. A87644