128655828 has 144 divisors (see below), whose sum is σ = 393609216. Its totient is φ = 34655040.

The previous prime is 128655809. The next prime is 128655829. The reversal of 128655828 is 828556821.

128655828 is a `hidden beast` number, since 1 + 2 + 8 + 65 + 582 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128655829) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 335725 + ... + 336107.

Almost surely, 2^128655828 is an apocalyptic number.

128655828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128655828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196804608).

128655828 is an abundant number, since it is smaller than the sum of its proper divisors (264953388).

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

128655828 is a wasteful number, since it uses less digits than its factorization.

128655828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 469 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The square root of 128655828 is about 11342.6552446947. The cubic root of 128655828 is about 504.8276744313.

The spelling of 128655828 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, eight hundred twenty-eight".