258 (number) explained

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

Number:	258
Divisor:	1, 2, 3, 6, 43, 86, 129, 258

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]

Notes and References

1. Web site: Sloane's A007304 : Sphenic numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-04-21.
2. Web site: Sloane's A005277 : Nontotients. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-04-20.
3. Web site: Sloane's A002858 : Ulam numbers. The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. 2016-04-21.