Properties of the Number 27643

Twenty-Seven Thousand Six Hundred Forty-Three

Basics

Value: 27642 → 27643 → 27644

Parity: odd

Prime: No

Previous Prime: 27631

Next Prime: 27647

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 7 × 11 × 359

Divisors: 1, 7, 11, 77, 359, 2513, 3949, 27643

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110101111111011

Octal: 65773

Duodecimal: 13BB7

Hexadecimal: 6bfb

Square: 764135449

Square Root: 166.26184168353242

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 k such that k and k+1 have the same sum of unitary divisors (A034448). A64125

Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999). A293183

Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417). A306985

Array read by antidiagonals: T(m,n) is the number of (non-null) induced trees in the grid graph P_m X P_n. A360202

a(n) = 27·2ⁿ - 5. A304387

Number of partitions p of n such that min(p) <= (number of parts of p) <= max(p). A325343

Least number·such that xⁿ has n digits equal to k. Case k=5. A285452

Numbers n such that n¹⁰+10 is prime. A239347

Number of (n+1)X(5+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction. A250653

Numbers k such that A113184(k) = A113184(k+1). A348585