128 is the natural number following 127 and preceding 129. In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 127 is the natural number following 126 and preceding 128. ... 129 is the natural number following 128 and preceding 130. ...

Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are a generalized kind of number used to denote the size of a set. ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... In mathematics and computer science, base-16, hexadecimal, or simply hex, is a numeral system with a radix or base of 16, usually written using the symbols 0–9 and A–F or a–f. ...

In mathematics

One hundred [and] twenty-eight is the seventh power of 2. It is the largest number which can not be expressed as the sum of any number of distinct squares. But it is divisible by the total number of its divisors, making it a refactorable number. In mathematics, a square number, sometimes also called a perfect square, is an integer that can be written as the square of some other integer. ... A refactorable number or tau number is an integer n that is divisible by the count of its divisors, or to put it algebraically, n is such that . ...

The sum of Euler's totient function φ(x) over the first twenty integers is 128. The first thousand values of φ(n) In number theory, the totient (n) of a positive integer n is defined to be the number of positive integers less than or equal to n and coprime to n. ...

128 can be expressed by a combination of its digits with mathematical operators thus 128 = 2^{8 - 1}, making it a Friedman number in base 10. 128 is a Zuckerman number in bases 7, 10 and 15. A Friedman number is an integer which, in a given base, is the result of an expression using all its own digits in combination with any of the four basic arithmetic operators (+, -, ×, ÷) and sometimes exponentiation. ... A Zuckerman number is an integer that is divisible by the product of its digits in a given number base. ...

In other fields

One hundred [and] twenty-eight is also:

• The size, in bits, of certain integer data types, used in computer representations of numbers.
• The number of character codes in ASCII (a 7-bit, not 8-bit, code).
• Any bit with a binary prefix is 128 bytes of a lesser binary prefix vaule. For example, 1 gibibit is 128 mebibytes.
• In megabytes, a common size for USB flash drives and memory cards.
• The number of sons of Anathoth at the Census of men of Israel upon return from exile (the Bible, Ezra 2:23). Also, the number of singers, sons of Asaph (Ezra 2:41).
• The number of musical instruments specified in General MIDI. Sometimes they are numbered 0 to 127 and sometimes they are numbered 1 to 128.
• The year 128 AD or 128 BC.