Farcaster

The number 75 has several notable features and associations. Mathematically, it is an odd composite number and can be factored into primes as 3 × 5². It is also the sum of the first five pentagonal numbers (1 + 5 + 12 + 22 + 35 = 75). In the world of chemistry, 75 is the atomic number of rhenium, a rare metal used in high-temperature superalloys and jet engine components due to its high melting point. Historically, 75 years marks the length of the average human lifespan, making it a significant milestone in demographics and social planning. Culturally, the number 75 is often associated with celebrations, such as the diamond anniversary, which commemorates 75 years of an event, typically a wedding or an organizational founding.