128444629 has 8 divisors (see below), whose sum is σ = 129958200. Its totient is φ = 126936000.

The previous prime is 128444597. The next prime is 128444633. The reversal of 128444629 is 926444821.

It can be written as a sum of positive squares in 4 ways, for example, as 27984100 + 100460529 = 5290^2 + 10023^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128444629 - 2⁵ = 128444597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128444591 and 128444600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128444669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82147 + ... + 83695.

It is an arithmetic number, because the mean of its divisors is an integer number (16244775).

Almost surely, 2^128444629 is an apocalyptic number.

It is an amenable number.

128444629 is a deficient number, since it is larger than the sum of its proper divisors (1513571).

128444629 is a wasteful number, since it uses less digits than its factorization.

128444629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2471.

The product of its digits is 110592, while the sum is 40.

The square root of 128444629 is about 11333.3414754873. The cubic root of 128444629 is about 504.5512845824.

The spelling of 128444629 in words is "one hundred twenty-eight million, four hundred forty-four thousand, six hundred twenty-nine".