128644 has 12 divisors (see below), whose sum is σ = 233100. Its totient is φ = 62048.

The previous prime is 128629. The next prime is 128657. The reversal of 128644 is 446821.

It can be written as a sum of positive squares in 2 ways, for example, as 26244 + 102400 = 162^2 + 320^2 .

It is an unprimeable number.

128644 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 3 ways as a sum of consecutive naturals, for example, 439 + ... + 670.

It is an arithmetic number, because the mean of its divisors is an integer number (19425).

2¹²⁸⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

128644 is a deficient number, since it is larger than the sum of its proper divisors (104456).

128644 is a wasteful number, since it uses less digits than its factorization.

128644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1140 counting only the distinct ones).

The product of its digits is 1536, while the sum is 25.

The square root of 128644 is about 358.6697645467. The cubic root of 128644 is about 50.4812203478.

The spelling of 128644 in words is "one hundred twenty-eight thousand, six hundred forty-four".