78 (number)

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Cardinal

seventy-eight

Ordinal

78th
(seventy-eighth)

Factorization

2 × 3 × 13

Divisors

1, 2, 3, 6, 13, 26, 39, 78

Greek numeral

ΟΗ´

Roman numeral

LXXVIII

Binary

1001110₂

Ternary

2220₃

Senary

210₆

Octal

116₈

Duodecimal

66₁₂

Hexadecimal

4E₁₆

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

In mathematics[edit]

78 is:

the dimension of the exceptional Lie group E₆ and several related objects.
a sphenic number, having 3 distinct prime factors.^[1]
an abundant number with an aliquot sum of 90.
a semiperfect number, as a multiple of a perfect number.
the 12th triangular number.
a palindromic number in bases 5 (303₅), 7 (141₇), 12 (66₁₂), 25 (33₂₅), and 38 (22₃₈).
a Harshad number in bases 3, 4, 5, 6, 7, 13 and 14.
an Erdős–Woods number, since it is possible đồ sộ find sequences of 78 consecutive integers such that each inner thành viên shares a factor with either the first or the last thành viên.^[2]

77 and 78 size a Ruth–Aaron pair.

78 is also:

In reference đồ sộ gramophone records, 78 refers those meant đồ sộ be spun at 78 revolutions per minute. Compare: LP, 33+1⁄3 and 45 rpm. 33 + 45 = 78
A typical tarot deck containing the 21 trump cards, the Fool and the 56 suit cards trang điểm 78 cards
The Rule of 78s is a method of yearly interest calculation
The number used by Martin Truex Jr. and Furniture Row Racing đồ sộ win the 2017 Monster Energy NASCAR Cup Series championship and năm nhâm thìn Coca-Cola 600. The team and driver Regan Smith also won the 2011 Showtime Southern 500 with 78. The number is now used by owner-driver B.J. McLeod for Live Fast Motorsports.