248 (number)

248 (two hundred [and] forty-eight) is the natural number following 247 and preceding 249.

← 247 248 249 →
← 240 241 242 243 244 245 246 247 248 249 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred forty-eight
Ordinal	248th (two hundred forty-eighth)
Factorization	23 × 31
Greek numeral	ΣΜΗ´
Roman numeral	CCXLVIII, ccxlviii
Binary	111110002
Ternary	1000123
Senary	10526
Octal	3708
Duodecimal	18812
Hexadecimal	F816

Additionally, 248 is:

• a nontotient. ^[1]
• a refactorable number. ^[2]
• an untouchable number. ^[3]
• palindromic in bases 13 (161₁₃), 30 (88₃₀), 61 (44₆₁) and 123 (22₁₂₃).
• a Harshad number in bases 3, 4, 6, 7, 9, 11, 13 (and 18 other bases).
• part of the 43-aliquot tree. The aliquot sequence starting at 248 is: 248, 232, 218, 112, 136, 134, 70, 74, 40, 50, 43, 1, 0.

The exceptional Lie group E₈ has dimension 248.

References

1. Sloane, N. J. A. (ed.). "SequenceA005277(nontotients)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
2. Sloane, N. J. A. (ed.). "SequenceA033950(refactorable numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. Sloane, N. J. A. (ed.). "SequenceA005114(Untouchable numbers: impossible values for sum of aliquot parts of n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.