The number 34613000 when expressed in exponential form is equal to

1. 3461.3 x 10³
2. 3.4613 x 10⁷
3. 0.34613 x 10⁹
4. 34.613 x 10⁵

Move the decimal 7 places to the left: 3.4613 x 10⁷.

Verification: 3.4613 x 10,000,000 = 34613000.

Hence, option 2 is the correct option.