Properties of the Number 71990

Seventy-One Thousand Nine Hundred Ninety

Basics

Value: 71989 → 71990 → 71991

Parity: even

Prime: No

Previous Prime: 71987

Next Prime: 71993

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 × 5 × 23 × 313

Divisors: 1, 2, 5, 10, 23, 46, 115, 230, 313, 626

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10001100100110110

Octal: 214466

Duodecimal: 357B2

Hexadecimal: 11936

Square: 5182560100

Square Root: 268.30952275310693

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

Partial sums of A253088. A255048

s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n+1-k), where k = [ (n+1)/2 ], s = (Fibonacci numbers), t = A000201 (lower Wythoff sequence). A24464

T(n,k) = number of n X k nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down. A253223

Number of n X 5 nonnegative integer arrays with upper left 0 and lower right its king-move distance away minus 2 and every value within 2 of its king move distance from the upper left and every value increasing by 0 or 1 with every step right, diagonally se or down. A253220

Numerators of the partial sums of the reciprocals of the upper members of twin prime pairs. A71990