# 78

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• List of numbers
• Integers

← 0 10 đôi mươi 30 40 50 60 70 80 90 →

Cardinalseventy-eight
Ordinal78th
(seventy-eighth)
Factorization2 × 3 × 13
Divisors1, 2, 3, 6, 13, 26, 39, 78
Greek numeralΟΗ´
Roman numeralLXXVIII
Binary10011102
Ternary22203
Senary2106
Octal1168
Duodecimal6612
Hexadecimal4E16

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

## In mathematics

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.

## In science

• The atomic number of platinum.

## In other fields

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+13 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.