128984556 has 12 divisors (see below), whose sum is σ = 300963992. Its totient is φ = 42994848.

The previous prime is 128984543. The next prime is 128984579. The reversal of 128984556 is 655489821.

It is a tau number, because it is divible by the number of its divisors (12).

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, 5374345 + ... + 5374368.

Almost surely, 2^128984556 is an apocalyptic number.

It is an amenable number.

128984556 is an abundant number, since it is smaller than the sum of its proper divisors (171979436).

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

128984556 is a wasteful number, since it uses less digits than its factorization.

128984556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10748720 (or 10748718 counting only the distinct ones).

The product of its digits is 691200, while the sum is 48.

The square root of 128984556 is about 11357.1367870604. The cubic root of 128984556 is about 505.2572698213.

The spelling of 128984556 in words is "one hundred twenty-eight million, nine hundred eighty-four thousand, five hundred fifty-six".