128394877952 has 88 divisors (see below), whose sum is σ = 280189953792. Its totient is φ = 58321203200.

The previous prime is 128394877883. The next prime is 128394877991. The reversal of 128394877952 is 259778493821.

It is a tau number, because it is divible by the number of its divisors (88).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21747833 + ... + 21753735.

Almost surely, 2^128394877952 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 128394877952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140094976896).

128394877952 is an abundant number, since it is smaller than the sum of its proper divisors (151795075840).

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

128394877952 is a wasteful number, since it uses less digits than its factorization.

128394877952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7865 (or 7847 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 65.

The spelling of 128394877952 in words is "one hundred twenty-eight billion, three hundred ninety-four million, eight hundred seventy-seven thousand, nine hundred fifty-two".