78 (number)

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77 78 79
Cardinal seventy-eight
Ordinal 78th
(seventy-eighth)
Factorization 2 × 3 × 13
Divisors 1, 2, 3, 6, 13, 26, 39, 78
Roman numeral LXXVIII
Binary 10011102
Ternary 22203
Quaternary 10324
Quinary 3035
Senary 2106
Octal 1168
Duodecimal 6612
Hexadecimal 4E16
Vigesimal 3I20
Base 36 2636

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

In mathematics[edit]

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[edit]

In other fields[edit]

78 is also: