complete the pattern and give reason,

23, 28, 38, 49, 62, ?.

In the given pattern sum of the digits of the number is added to the number.

i.e.

23 + 2 + 3 = 28

28 + 2 + 8 = 38

38 + 3 + 8 = 49

49 + 4 + 9 = 62

62 + 6 + 2 = 70

Hence the required number is 70

and the completed pattern is 23, 28, 38, 49, 62, 70.