128128984 has 16 divisors (see below), whose sum is σ = 244775520. Its totient is φ = 62855520.

The previous prime is 128128963. The next prime is 128128999. The reversal of 128128984 is 489821821.

It is a self number, because there is not a number n which added to its sum of digits gives 128128984.

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, 150672 + ... + 151519.

It is an arithmetic number, because the mean of its divisors is an integer number (15298470).

Almost surely, 2^128128984 is an apocalyptic number.

It is an amenable number.

128128984 is a deficient number, since it is larger than the sum of its proper divisors (116646536).

128128984 is a wasteful number, since it uses less digits than its factorization.

128128984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302250 (or 302246 counting only the distinct ones).

The product of its digits is 73728, while the sum is 43.

The square root of 128128984 is about 11319.4074049837. The cubic root of 128128984 is about 504.1376440214.

The spelling of 128128984 in words is "one hundred twenty-eight million, one hundred twenty-eight thousand, nine hundred eighty-four".