Properties of the Number -128778

One Hundred Twenty-Eight Thousand Seven Hundred Seventy-Eight

Basics

Value: -128779 → -128778 → -128777

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 2 × 3 × 13 ² × 127

Divisors: 1, 2, 3, 6, 13, 26, 39, 78, 127, 169

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -11111011100001010

Octal: -373412

Duodecimal: -62636

Hexadecimal: -1f70a

Square: 16583773284

Square Root: 358.8565172878988

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

Greatest number m such that the fractional part of π^A153711(m) >= 1-(1/m). A153715

Number of unrooted quartic trees with 2n (unlabeled) nodes and possessing a bicentroid; number of 2n-carbon alkanes C(2n)H(4n+2) with a bicentroid, ignoring stereoisomers. A10373

a(n) = (m(n)² + 3)*(m(n)² + 7)/32, where m(n) = 2·n - 1. A336535

Numbers that can be represented as p^r + q^s with 4 distinct odd primes p, q, r, s. A390179

Triangular numbers whose sum of squared digits is also triangular. A94890

Numbers of the form prime(n) + prime(n+1) - 2 that are also triangular numbers, T(k) = k(k+1)/2. A110891

Triangular numbers which are sums of 6 consecutive primes. A173423

Triangular numbers that are repdigits with length > 2 in some base. A274084