Properties of the Number -287980

Two Hundred Eighty-Seven Thousand Nine Hundred Eighty

Basics

Value: -287981 → -287980 → -287979

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5 × 7 × 11 ² × 17

Divisors: 1, 2, 4, 5, 7, 10, 11, 14, 17, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: Yes

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Representations

Binary: -1000110010011101100

Octal: -1062354

Duodecimal: -11A7A4

Hexadecimal: -464ec

Square: 82932480400

Square Root: 536.6376803766206

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 ways to choose three points in an (n X n)-grid (or geoplane). A178208

Values of C(n,3) which can be written as C(x,3) + C(y,3). A34404

Number of (w,x,y,z) with all terms in {1,...,n} and w <= x > y <= z. A212246

a(n) = ∏_{d∣n, d>1} prime(1+(d mod 8)). A320108

Length of period of continued fraction expansion of square root of 3ⁿ+1. A62328

a(n) = (32·n³ - 2·n)/3. A267031

Triangle read by rows, T(n,k) = (binomial(n,k)³ - binomial(n,k))/6 for k=1..n-1 and n >= 2. A373101

Quarter-square tetrahedrals: a(n) = k*(k - 1)*(k - 2)/6, k = A002620(n). A217482