128646 has 24 divisors (see below), whose sum is σ = 318864. Its totient is φ = 36720.

The previous prime is 128629. The next prime is 128657. The reversal of 128646 is 646821.

128646 is a `hidden beast` number, since 12 + 8 + 646 = 666.

It is a Curzon number.

It is a nialpdrome in base 11.

It is a congruent number.

It is an unprimeable number.

128646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 385 + ... + 636.

It is an arithmetic number, because the mean of its divisors is an integer number (13286).

2¹²⁸⁶⁴⁶ is an apocalyptic number.

128646 is an abundant number, since it is smaller than the sum of its proper divisors (190218).

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

128646 is a wasteful number, since it uses less digits than its factorization.

128646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036 (or 1033 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 128646 is about 358.6725526159. The cubic root of 128646 is about 50.4814819533.

The spelling of 128646 in words is "one hundred twenty-eight thousand, six hundred forty-six".