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258 = 2343
BaseRepresentation
bin100000010
3100120
410002
52013
61110
7516
oct402
9316
10258
11215
12196
1316b
14146
15123
hex102

258 has 8 divisors (see below), whose sum is σ = 528. Its totient is φ = 84.

The previous prime is 257. The next prime is 263. The reversal of 258 is 852.

258 is an esthetic number in base 15, because in such base it adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

258 is an admirable number.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a straight-line number, since its digits are in arithmetic progression.

It is a plaindrome in base 10, base 13, base 14 and base 15.

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (2) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16 + ... + 27.

It is an arithmetic number, because the mean of its divisors is an integer number (66).

258 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264).

258 is a wasteful number, since it uses less digits than its factorization.

258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48.

The product of its digits is 80, while the sum is 15.

The square root of 258 is about 16.0623784042. The cubic root of 258 is about 6.3660967604.

The spelling of 258 in words is "two hundred fifty-eight", and is thus an aban number.

Divisors: 1 2 3 6 43 86 129 258