Convert a number to a hexadecimal string with:

hexString = yourNumber.toString(16);

And reverse the process with:

yourNumber = parseInt(hexString, 16);

To convert an integer to a hexadecimal value in JavaScript, you can use the Number.toString() method and specify a radix of 16 (hexadecimal) as the second argument. For example, to convert the integer 7654321 to a hexadecimal value, you could use the following code:

const intValue = 7654321;
const hexValue = intValue.toString(16);
console.log(hexValue);  // Output: "b1bcd1"

In Web3.js, you can use the web3.utils.toHex() method to convert an integer to a hexadecimal value. This method takes the integer value as the first argument and an optional second argument that specifies the number of characters in the resulting hexadecimal value. For example, to convert the integer 7654321 to a hexadecimal value with 8 characters, you could use the following code:

const intValue = 7654321;
const hexValue = web3.utils.toHex(intValue, 8);
console.log(hexValue);  // Output: "00000b1bcd1"

You can then use the hexValue variable in your automation script as needed.

You can use the to string method:

a = 64;
a.toString(16); // prints "40" which is the hex value
a.toString(8); // prints "100" which is the octal value
a.toString(2); // prints "1000000" which is the binary value