128585556 has 120 divisors (see below), whose sum is σ = 371189280. Its totient is φ = 38491200.

The previous prime is 128585531. The next prime is 128585557. The reversal of 128585556 is 655585821.

128585556 is a `hidden beast` number, since 12 + 8 + 5 + 85 + 556 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128585557) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 388311 + ... + 388641.

It is an arithmetic number, because the mean of its divisors is an integer number (3093244).

Almost surely, 2^128585556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128585556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185594640).

128585556 is an abundant number, since it is smaller than the sum of its proper divisors (242603724).

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

128585556 is a wasteful number, since it uses less digits than its factorization.

128585556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 456 counting only the distinct ones).

The product of its digits is 480000, while the sum is 45.

The square root of 128585556 is about 11339.5571342094. The cubic root of 128585556 is about 504.7357451558.

The spelling of 128585556 in words is "one hundred twenty-eight million, five hundred eighty-five thousand, five hundred fifty-six".