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The number 70 has various intriguing aspects. Mathematically, it is a composite number and the product of the primes 2, 5, and 7 (2 × 5 × 7 = 70). It is also a Harshad number, which means it is divisible by the sum of its digits (7 + 0 = 7; 70 ÷ 7 = 10). In the Bible, the number 70 often signifies completeness or a generation, such as the 70 elders of Israel or the 70 years of the Babylonian exile. In science, 70 is the atomic number of ytterbium, a rare earth element used in various high-tech applications, including improving the strength of stainless steel. Additionally, in modern culture, turning 70 is seen as a significant milestone, often associated with retirement and the celebration of a life well-lived.