128658 has 16 divisors (see below), whose sum is σ = 264096. Its totient is φ = 41760.

The previous prime is 128657. The next prime is 128659. The reversal of 128658 is 856821.

It is an interprime number because it is at equal distance from previous prime (128657) and next prime (128659).

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (128657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16 + ... + 507.

It is an arithmetic number, because the mean of its divisors is an integer number (16506).

2¹²⁸⁶⁵⁸ is an apocalyptic number.

128658 is an abundant number, since it is smaller than the sum of its proper divisors (135438).

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

128658 is a wasteful number, since it uses less digits than its factorization.

128658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569.

The product of its digits is 3840, while the sum is 30.

The square root of 128658 is about 358.6892805758. The cubic root of 128658 is about 50.4830515291.

The spelling of 128658 in words is "one hundred twenty-eight thousand, six hundred fifty-eight".