What is the number? It has seven digits. The value of one of its digits is 600. Two of the digits in the thousands period are 7's and the third one of them has a value of 3 x 10,000. The digit withe greatest place value in the number is between four and six, and the digit with the least place value is one-half of sixteen. One of the digits in the one's period is 4.

first we know the number is x,xxx,6xx

Then, we see that it is x,737,6xx

next, we have 5,737,6xx
next, 5,737,6x8
last, 5,737,648