128555444 has 12 divisors (see below), whose sum is σ = 236812800. Its totient is φ = 60894648.

The previous prime is 128555437. The next prime is 128555461. The reversal of 128555444 is 444555821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 128555398 and 128555407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 845684 + ... + 845835.

It is an arithmetic number, because the mean of its divisors is an integer number (19734400).

Almost surely, 2^128555444 is an apocalyptic number.

It is an amenable number.

128555444 is a deficient number, since it is larger than the sum of its proper divisors (108257356).

128555444 is a wasteful number, since it uses less digits than its factorization.

128555444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691542 (or 1691540 counting only the distinct ones).

The product of its digits is 128000, while the sum is 38.

The square root of 128555444 is about 11338.2293150209. The cubic root of 128555444 is about 504.6963426242.

The spelling of 128555444 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, four hundred forty-four".