Properties of the Number 26680

Twenty-Six Thousand Six Hundred Eighty

Basics

Value: 26679 → 26680 → 26681

Parity: even

Prime: No

Previous Prime: 26669

Next Prime: 26681

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ³ × 5 × 23 × 29

Divisors: 1, 2, 4, 5, 8, 10, 20, 23, 29, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 110100000111000

Octal: 64070

Duodecimal: 13534

Hexadecimal: 6838

Square: 711822400

Square Root: 163.34013591276334

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 which can be expressed as the product of a number and its reversal in at least two different ways. A66531

Long leg B of primitive Pythagorean triangles such that perimeters are Averages of twin prime pairs, q=p+1, a=q²-p², c=q²+p², b=2·p*q, s=a+b+c, s-+1 are primes. A155174

T(n,k) is the number of (n+1) X (k+1) 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2 X 2 permanents nonzero. A204740

a(n) = 2·a(n-1) + a(n-2) + a(n-3) + a(n-4), with a(0)=1, a(1)=2, a(3)=5, a(4)=13. A103142

Numerator of Hermite(n, 10/17). A159538

Least common multiple of 7·n+1 and 7·n-1. A282286

Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section. A287040

Numbers k such that the number of divisors of k equals the number of anti-divisors of k. A73694

a(n) = n*(2·n² + 5·n + 13)/2. A163655

Number of (w,x,y,z) with all terms in {1,...,n} and |w-x| = 2*|x-y| - |y-z|. A212578