888 (number)

888 is a base ten repdigit (a number all of whose digits are equal),[1] and

${\displaystyle 888=24\times 37.}$

Where 37 is the 12th prime number. 888 is the smallest multiple of twenty-four divisible by all of its digits,[2] whose digit sum is also itself.[3]

888 is a practical number, meaning that every positive integer up to 888 itself may be represented as a sum of distinct divisors of 888.[4]

888³ = 700227072 is the smallest cube in which each digit occurs exactly three times,[5] and the only cube in which three distinct digits each occur three times.[6]

It is a happy number in decimal, meaning that repeatedly summing the squares of its digits eventually leads to 1:

${\displaystyle 888\mapsto 64+64+64=192\mapsto 1+81+4=86\mapsto 64+36=100\mapsto 1.}$

There are exactly:

• 888 trees with four unlabeled and three labeled nodes,[7]
• 888 seven-node undirected graphs without isolated vertices,[8] and
• 888 non-alternating knots whose crossing number is 12.[9]

888 is equal to the sum of the first two Giuga numbers: 30 + 858 = 888.[10]

The number 888 is often symbolised within the international labour movement to symbolise the 8-hour day. Workers protested for 8 hours work, 8 hours rest and 8 hours time to themselves.

In some Christian numerology, the number 888 represents Jesus, or sometimes more specifically Christ the Redeemer. This representation may be justified either through gematria, by counting the letter values of the Greek transliteration of Jesus' name,[11] or as an opposing value to 666, the number of the beast.[12] The numerological representation of Jesus with the number 888, as the sum of the numerical values of the letters of his name, was condemned by the Church father Irenaeus as convoluted and an act which reduced "the Lord of all things" to something alphabetical.[13]

In Chinese numerology, 888 usually means triple fortune, as a form of strengthening of the digit 8. On its own, the number 8 is often associated with great fortune, wealth and spiritual enlightenment. Hence, 888 is considered triple.[14] For this reason, addresses and phone numbers containing the digit sequence 888 are considered particularly lucky, and may command a premium because of it.[15]

• 888 (disambiguation)