872021600128 has 128 divisors (see below), whose sum is σ = 2060198807040. Its totient is φ = 359889868800.

The previous prime is 872021600113. The next prime is 872021600141. The reversal of 872021600128 is 821006120278.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2576098 + ... + 2894878.

It is an arithmetic number, because the mean of its divisors is an integer number (16095303180).

Almost surely, 2^872021600128 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 872021600128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030099403520).

872021600128 is an abundant number, since it is smaller than the sum of its proper divisors (1188177206912).

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

872021600128 is a wasteful number, since it uses less digits than its factorization.

872021600128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318916 (or 318904 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 872021600128 in words is "eight hundred seventy-two billion, twenty-one million, six hundred thousand, one hundred twenty-eight".