128708021832 has 192 divisors, whose sum is σ = 361254297600. Its totient is φ = 38155703040.

The previous prime is 128708021737. The next prime is 128708021833. The reversal of 128708021832 is 238120807821.

It is not an unprimeable number, because it can be changed into a prime (128708021833) 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, 30048763 + ... + 30053045.

It is an arithmetic number, because the mean of its divisors is an integer number (1881532800).

Almost surely, 2^128708021832 is an apocalyptic number.

128708021832 is a gapful number since it is divisible by the number (12) 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 128708021832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180627148800).

128708021832 is an abundant number, since it is smaller than the sum of its proper divisors (232546275768).

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

128708021832 is a wasteful number, since it uses less digits than its factorization.

128708021832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588 (or 4571 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The spelling of 128708021832 in words is "one hundred twenty-eight billion, seven hundred eight million, twenty-one thousand, eight hundred thirty-two".