128388937800 has 96 divisors (see below), whose sum is σ = 398414901600. Its totient is φ = 34201850880.

The previous prime is 128388937777. The next prime is 128388937811. The reversal of 128388937800 is 8739883821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 476691 + ... + 695709.

It is an arithmetic number, because the mean of its divisors is an integer number (4150155225).

Almost surely, 2^128388937800 is an apocalyptic number.

128388937800 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 128388937800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199207450800).

128388937800 is an abundant number, since it is smaller than the sum of its proper divisors (270025963800).

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

128388937800 is a wasteful number, since it uses less digits than its factorization.

128388937800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220015 (or 220006 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 57.

The spelling of 128388937800 in words is "one hundred twenty-eight billion, three hundred eighty-eight million, nine hundred thirty-seven thousand, eight hundred".