Properties of the Number -640080

Six Hundred Forty Thousand Eighty

Basics

Value: -640081 → -640080 → -640079

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ⁴ × 3 ² × 5 × 7 × 127

Divisors: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -10011100010001010000

Octal: -2342120

Duodecimal: -26A500

Hexadecimal: -9c450

Square: 409702406400

Square Root: 800.0499984375977

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

Expansion of θ series of E₇ lattice in powers of q². A4008

Triangle T(n, k, m) = f(n, m)/(f(k, m)*f(n-k, m)), where T(0, k, m) = 1, f(n, k) = ∏_j=1..n ( j!*((k+1)^j -1)/k ), f(n, 0) = n!, and m = 1, read by rows. A156765

a(n) = (2ⁿ - 1)*n!. A52589

Numbers k such that A380845(k)/k > A380845(m)/m for all m < k. A381070

Number of closed paths of length n whose steps are 9th roots of unity, U₉(n). A198810

Number of n X 7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 1 vertically. A207452

Weight distribution of [127,36,31] primitive binary BCH code. A151813