# 128 (number)

 ← 127 128 129 →
Cardinalone hundred twenty-eight
Ordinal128th
(one hundred twenty-eighth)
Factorization27
Divisors1, 2, 4, 8, 16, 32, 64, 128
Greek numeralΡΚΗ´
Roman numeralCXXVIII
Binary100000002
Ternary112023
Quaternary20004
Quinary10035
Senary3326
Octal2008
DuodecimalA812
Vigesimal6820
Base 363K36

128 (one hundred [and] twenty-eight) is the natural number following 127 and preceding 129.

## In mathematics

128 is the seventh power of 2. It is the largest number which cannot be expressed as the sum of any number of distinct squares.[1][2] But it is divisible by the total number of its divisors, making it a refactorable number.[3]

The sum of Euler's totient function φ(x) over the first twenty integers is 128.[4]

128 can be expressed by a combination of its digits with mathematical operators thus 128 = 28 - 1, making it a Friedman number in base 10.[5]

A hepteract has 128 vertices.

128 is the only 3-digit number that is a 7th power (27).

Other Languages
العربية: 128 (عدد)
azərbaycanca: 128 (ədəd)
تۆرکجه: ۱۲۸ (سایی)
Bân-lâm-gú: 128
български: 128 (число)
Чӑвашла: 128 (хисеп)
čeština: 128 (číslo)
Ελληνικά: 128 (αριθμός)
emiliàn e rumagnòl: 128 (nùmer)
فارسی: ۱۲۸ (عدد)
français: 128 (nombre)
Gaeilge: 128 (uimhir)
한국어: 128
հայերեն: 128 (թիվ)
Արեւմտահայերէն: 128 (թիւ)
italiano: 128 (numero)
magyar: 128 (szám)
македонски: 128 (број)
Bahasa Melayu: 128 (nombor)
Mìng-dĕ̤ng-ngṳ̄: 128
Nederlands: 128 (getal)

norsk: 128 (tall)
oʻzbekcha/ўзбекча: 128 (son)
پښتو: ۱۲۸ (عدد)
polski: 128 (liczba)
русский: 128 (число)
Sesotho sa Leboa: 128 (nomoro)
slovenščina: 128 (število)
svenska: 128 (tal)
татарча/tatarça: 128 (сан)
ไทย: 128
українська: 128 (число)
اردو: 128 (عدد)
Vahcuengh: 128
Tiếng Việt: 128 (số)