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78 (number)

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78 (number)

78 (seventy-eight) is the natural number following 77 and followed by 79.

In mathematics

With 3 distinct prime factors 78 is a sphenic number. It is an abundant number with an aliquot sum of 90. As a multiple of a perfect number, 78 is itself a semiperfect number.

78 is the 12th triangular number.

77 and 78 form a Ruth-Aaron pair.

Since it is possible to find sequences of 78 consecutive integers such that each inner member shares a factor with either the first or the last member, 78 is an Erdős–Woods number.

In science

In other fields

78 is also:

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