Properties of the Number -628

Six Hundred Twenty-Eight

Basics

Value: -629 → -628 → -627

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 157

Divisors: 1, 2, 4, 157, 314, 628

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: -1001110100

Octal: -1164

Duodecimal: -444

Hexadecimal: -274

Square: 394384

Square Root: 25.059928172283335

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) = 2·1 - 4·3 + 6·5 - 8·7 + 10·9 - 12·11 + 14·13 - 16·15 + ... - (up to the n-th term). A319885

G.f.: ∑_n>=0 xⁿ * (xⁿ⁺¹ + i)ⁿ / (1 + i·xⁿ⁺¹)ⁿ⁺¹. A324300

Express the ∑_n>=0 p(n)*xⁿ, where p(n) is the partition function, as a product ∏_k>=1 (1 + a(k)*x^k). A220420

Choose smallest m>0 such that the n-th rational prime p ramifies in the imaginary quadratic extension field K = Q(sqrt(-m)); a(n) = discriminant(K). A220861

Triangle T(n,k) read by rows: coefficient [x^k] of the polynomial h(n,x) with h(0,x)=1, h(1,x)=1-x and recursively h(n,x) = 1 + n -(1-x)*(1-h(n-1,x)) - n·h(n-2,x). A136247

Expansion of (1 + x)² / ((1 - x)²*(1 + 2·x + 2·x²)²). A322040

a(1) = 1; a(n+1) = a(n) +- (sum of digits of a(1) up to a(n)), with "+" when a(n) is odd, or "-" if even. A332058

a(n) = ∑_k=0..n (-1)^k*k·Fibonacci(k), where Fibonacci(k) = A000045(k). A263878

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 286", based on the 5-celled von Neumann neighborhood. A271124

First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 419", based on the 5-celled von Neumann neighborhood. A272048