Using digits 1-7 round to 6,300,000

Mathematics rule of rounding a number.

Let’s create a 7 digit number composed of 1-7 digits to be rounded to 6,300,000.

Let's have 6,312,457 in where:

7=ones, 5=tens, 4=hundreds, 2 = thousands, 1 = ten thousands, 3 = hundred thousands, 6 = millions.

Another rule in rounding off numbers. Any number less than 5, round down. Any number more than 5, round up.

Therefore: 6,312,457 will be rounded to 6,300,000.