645000

645000 is a natural number in base ten. It lies between 644999 and 645001 and is equal to 645 × 1000, classifying it as a round thousand multiple.

Mathematical properties: Its prime factorization is 2^3 × 3 × 5^4 × 43, giving it 80 positive divisors. It is divisible by 8, 3, 125, and 1000; hence it is a multiple of 1000 and of 125. The digits sum to 15, so it is a Harshad number in base 10, since 645000 ÷ 15 = 43000. Its approximate square root is about 803.6, and it is not a perfect square (803^2 = 644,809; 804^2 = 646,416). In scientific notation, it is 6.45 × 10^5. In hexadecimal, it equals 0x9D788.

Context and usage: As a rounded figure, 645000 is often used in examples and datasets to illustrate thousand-scale values or financial figures. There is no widely recognized meaning attached to the number itself beyond its mathematical properties, and it is not known to designate a specific location, event, or product.