256 (szám)

256
(kétszázötvenhat)
… 252 253 254 255 « 256 » 257 258 259 260 …
… 220 230 240 250  260 270 280 290 …
… 0 100 200  300 400 500 600 …
… 25 26 27 « 28 » 29 210 211 …
Tulajdonságok
Normálalak2,56 · 102
Kanonikus alak28
Osztók1, 2, 4, 8, 16, 32, 64, 128, 256
Római számmalCCLVI
Számrendszerek
Bináris alak1 0000 00002
Oktális alak4008
Hexadecimális alak10016
Számelméleti függvények értékei
Euler-függvény128
Möbius-függvény0
Mertens-függvény−1
Osztók száma9
Osztók összege511
hiányos szám
Valódiosztó-összeg254

A 256 (római számmal: CCLVI) egy természetes szám, négyzetszám, a 16 négyzete; a 2 nyolcadik hatványa. A 4 negyedik hatványa (tehát 4↑↑2, lásd tetráció).

A szám a matematikában

A tízes számrendszerbeli 256-os a kettes számrendszerben 100000000, a nyolcas számrendszerben 400, a tizenhatos számrendszerben 100 alakban írható fel.

A 256 páros szám, összetett szám, azon belül négyzetszám, kanonikus alakban a 28 szorzattal, normálalakban a 2,56 · 102 szorzattal írható fel. Kilenc osztója van a természetes számok halmazán, ezek növekvő sorrendben: 1, 2, 4, 8, 16, 32, 64, 128 és 256.

A 256 négyzete 65 536, köbe 16 777 216, négyzetgyöke 16, köbgyöke 6,34960, reciproka 0,0039063. A 256 egység sugarú kör kerülete 1608,49544 egység, területe 205 887,41615 területegység; a 256 egység sugarú gömb térfogata 70 276 238,0 térfogategység.

A 256 helyen az Euler-függvény helyettesítési értéke 128, a Möbius-függvényé 0, a Mertens-függvényé −1.

Commons:Category:256 (number)
A Wikimédia Commons tartalmaz 256 (szám) témájú médiaállományokat.

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