Properties of the Number -71680

Seventy-One Thousand Six Hundred Eighty

Basics

Value: -71681 → -71680 → -71679

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 2 ¹¹ × 5 × 7

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: -10001100000000000

Octal: -214000

Duodecimal: -35594

Hexadecimal: -11800

Square: 5138022400

Square Root: 267.7312084909042

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

T(i,j) = (-1)^i+j*(i+1)*binomial(i,j)*2^i-j*4^j. A137337

13-almost primes (generalization of semiprimes). A69274

Numbers k such that (number of prime factors of k counted with multiplicity) less (number of distinct prime factors of k) = 10. A195069

Denominators of coefficients in function a(x) such that a(a(x)) = sin x. A48603

Triangle T, read by rows, where matrix power T^-2 has -2ⁿ⁺¹ in the secondary diagonal: [T^-2](n+1,n) = -2ⁿ⁺¹, with all 1's in the main diagonal and zeros elsewhere. A117265

a(n) = 2ⁿ*(n² - n + 8)/8. A81908

T(n,k)=Number of nXk 0..2 arrays with no element equal to a strict majority of its king-move neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. A279305

Denominators of coefficients for repeated integration. A2689

Triangle read by rows: Number of n-step self-avoiding walks on f.c.c. lattice ending at point with x = k. A227511

Triangular array: the fusion of polynomial sequences P and Q given by p(n,x)=(2x+1)ⁿ and q(n,x)=(x+2)ⁿ. A193734