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In finance, the rule of 72, the rule of 70 [1] and the rule of 69.3 are methods for estimating an investment's doubling time. The rule number (e.g., 72) is divided by the interest percentage per period (usually years) to obtain the approximate number of periods required for doubling.
You can divide 72 by the rate of inflation to get 24 years until the purchasing power of your money is reduced by 50 percent. High inflation, like the 8 percent rate we saw in 2022, drops the time ...
72 is the first number that can be expressed as the difference of the squares of primes in just two distinct ways: 11 2 − 7 2 = 19 2 − 17 2. [13] 72 is the sum of the first two sphenic numbers (30, 42), [14] which have a difference of 12, that is also their abundance. [15] [16]
In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or 20 / 5 = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...
d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n
Also, one can simply divide the number by 2, and then check the result to find if it is divisible by 2. If it is, the original number is divisible by 4. In addition, the result of this test is the same as the original number divided by 4. Example. General rule. 2092 (The original number)
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Furthermore, one of the divisors of 360 is 72, which is the number of primes below it. 360 is the sum of twin primes (179 + 181) and the sum of four consecutive powers of three (9 + 27 + 81 + 243). The sum of Euler's totient function φ(x) over the first thirty-four integers is 360. 360 is a triangular matchstick number. [4]