855808128 has 144 divisors (see below), whose sum is σ = 2864935710. Its totient is φ = 244500480.

The previous prime is 855808097. The next prime is 855808141. The reversal of 855808128 is 821808558.

It can be written as a sum of positive squares in only one way, i.e., 713530944 + 142277184 = 26712^2 + 11928^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48868 + ... + 64028.

Almost surely, 2^855808128 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 855808128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1432467855).

855808128 is an abundant number, since it is smaller than the sum of its proper divisors (2009127582).

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

855808128 is a wasteful number, since it uses less digits than its factorization.

855808128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15195 (or 15173 counting only the distinct ones).

The product of its (nonzero) digits is 204800, while the sum is 45.

The square root of 855808128 is about 29254.1984679123. The cubic root of 855808128 is about 949.4209316830.

The spelling of 855808128 in words is "eight hundred fifty-five million, eight hundred eight thousand, one hundred twenty-eight".