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The number 72 is rich with interesting properties and cultural significance. Mathematically, it is a highly composite number, having 12 divisors, and it is the product of the first three perfect numbers (2³ × 3² = 72). In geometry, a regular pentagon has internal angles of 72 degrees each. In astronomy, 72 is the atomic number of hafnium, a transition metal used in nuclear reactors and various high-temperature alloys. Culturally, the number 72 is significant in various traditions and texts, such as the 72 names of God in Kabbalah and the 72 demons listed in the Ars Goetia of the Lesser Key of Solomon. Additionally, in timekeeping, 72 years is one degree of precession in the Earth's axial precession cycle, emphasizing its role in the astronomical and calendrical systems.