Properties of the Number 68640

Sixty-Eight Thousand Six Hundred Forty

Basics

Value: 68639 → 68640 → 68641

Parity: even

Prime: No

Previous Prime: 68639

Next Prime: 68659

Digit Sum: 24

Digital Root: 6

Palindrome: No

Factorization: 2 ⁵ × 3 × 5 × 11 × 13

Divisors: 1, 2, 3, 4, 5, 6, 8, 10, 11, 12

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10000110000100000

Octal: 206040

Duodecimal: 33880

Hexadecimal: 10c20

Square: 4711449600

Square Root: 261.99236630100506

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

a(n) = n*(n+1)*(2·n+1). A55112

A partition product of Stirling₂ type [parameter k = -6] with biggest-part statistic (triangle read by rows). A157396

Numbers with prime factorization pqrst⁵. A190383

Lesser of semi-unitary amicable numbers pair: numbers (m, n) such that susigma(m) = susigma(n) = m + n, where susigma(n) is the sum of the semi-unitary divisors of n (A322485). A322541

Triangle, read by rows, where T(n,k) = n!/(k!*(n-3·k)!*3^k) for n>=3·k>=0. A118931

a(n) = A152800(n+2,2n+1) for n>=0. A152802

Denominators of Pythagorean approximations to 4. A195619

Numerators b(n) of Pythagorean approximations b(n)/a(n) to 1/4. A195563

Lesser of modified exponential amicable pairs. A323758

Triangle read by rows: see A128196 for definition. A126063