128958375840 has 384 divisors, whose sum is σ = 478574272512. Its totient is φ = 28575866880.

The previous prime is 128958375823. The next prime is 128958375869. The reversal of 128958375840 is 48573859821.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 22452009 + ... + 22457751.

It is an arithmetic number, because the mean of its divisors is an integer number (1246287168).

Almost surely, 2^128958375840 is an apocalyptic number.

128958375840 is a gapful number since it is divisible by the number (10) 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 128958375840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239287136256).

128958375840 is an abundant number, since it is smaller than the sum of its proper divisors (349615896672).

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

128958375840 is a wasteful number, since it uses less digits than its factorization.

128958375840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5972 (or 5964 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 60.

The spelling of 128958375840 in words is "one hundred twenty-eight billion, nine hundred fifty-eight million, three hundred seventy-five thousand, eight hundred forty".