258 (number)

← 257 258 259 →
← 250 251 252 253 254 255 256 257 258 259 → List of numbers ; Integers ; ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred fifty-eight
Ordinal	258th; (two hundred fifty-eighth)
Factorization	2 × 3 × 43
Divisors	1, 2, 3, 6, 43, 86, 129, 258
Greek numeral	ΣΝΗ´
Roman numeral	CCLVIII, cclviii
Binary	1000000102
Ternary	1001203
Senary	11106
Octal	4028
Duodecimal	19612
Hexadecimal	10216

Last updated September 16, 2025

258 (two hundred [and] fifty-eight) is the natural number following 257 and preceding 259.

In mathematics

258 is:

a sphenic number ^[1]
a nontotient ^[2]
the sum of four consecutive prime numbers because 258 = 59 + 61 + 67 + 71
6³ + 6² + 6
an Ulam number ^[3]

References

↑ "Sloane's A007304 : Sphenic numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-21.
↑ "Sloane's A005277 : Nontotients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-20.
↑ "Sloane's A002858 : Ulam numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-21.

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[1] "Sloane's A007304 : Sphenic numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-21.

[2] "Sloane's A005277 : Nontotients". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-20.

[3] "Sloane's A002858 : Ulam numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-04-21.

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