81600

81600 is a number that falls between 81,500 and 81,700 in the sequence of natural numbers. It is an even number, as it is divisible by 2 without leaving a remainder. In the decimal numeral system, it is written as "eighty-one thousand six hundred." The number 81600 can be expressed in scientific notation as 8.16 x 10^4, where the exponent 4 indicates the number of places the decimal point is moved to the right to obtain the original number.

In mathematics, 81600 is a composite number, meaning it has factors other than 1 and itself. Its prime factorization is 2^3 x 3 x 5^2 x 139, which shows that it is the product of these prime numbers raised to their respective powers. The number 81600 is also a perfect square, as it can be expressed as the square of 286 (286 x 286 = 81600).

In the context of the International Telecommunication Union (ITU) country calling codes, 81600 is not assigned to any country. The ITU maintains a list of country calling codes, which are used to identify the country for international telephone calls. As of the latest update, 81600 is not included in this list.