Properties of the Number 7280

Seven Thousand Two Hundred Eighty

Basics

Value: 7279 → 7280 → 7281

Parity: even

Prime: No

Previous Prime: 7253

Next Prime: 7283

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 2 ⁴ × 5 × 7 × 13

Divisors: 1, 2, 4, 5, 7, 8, 10, 13, 14, 16

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1110001110000

Octal: 16160

Duodecimal: 4268

Hexadecimal: 1c70

Square: 52998400

Square Root: 85.32291603080617

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

Number of n-bead necklaces with beads of 2 colors and primitive period n, when turning over is not allowed but the two colors can be interchanged. A48

a(n) = lcm{1,2,...,n} / swinging_factorial(n) = A003418(n) / A056040(n). A180000

Four times pentagonal numbers: a(n) = 2·n*(3·n-1). A33579

4-dimensional figurate numbers: a(n) = (5·n-1)*binomial(n+2,3)/4. A2418

a(n) = n*(n+2)*(n-2)/3. A77415

a(n) = n*(n+1)*(n+2)*(n+3)/6. A33488

Number of ways to change three non-identical letters in the word aabbccdd..., where there are n types of letters. A102860

Triangle read by rows: T(n,k) (n>=0, 0<=k<=A002620(n-1)) is the number of permutations of [n] with k nestings. A263776

Number of monic irreducible polynomials over GF(4) of degree n with fixed nonzero trace. A54660

Numbers k such that φ(x) = k has exactly 11 solutions. A60674