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The number of significant figures in the measurement is 4. Significant figures of a number are digits that carry meaning contributing to its measurement resolutions.These includes all digits (nonzero numbers), any zero between two non zero numbers is significant, a final zero or trailing zeros in the decimals are significant, all other zeros not mentioned are not significant.
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There are 4 significant figures in 0.007890. These are 7890, which has non zeroes 7 8 9 and a trailing zero after the non zero. The leading zero or the zeroes before the non zero digit in a decimal is not considered to be significant numbers. Zeros can also be considered significant if they exist between non-zero numbers like 2018.

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