128985804640 has 576 divisors, whose sum is σ = 410042787840. Its totient is φ = 37809192960.

The previous prime is 128985804589. The next prime is 128985804683. The reversal of 128985804640 is 46408589821.

128985804640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 365398704 + ... + 365399056.

It is an arithmetic number, because the mean of its divisors is an integer number (711879840).

Almost surely, 2^128985804640 is an apocalyptic number.

128985804640 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 128985804640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205021393920).

128985804640 is an abundant number, since it is smaller than the sum of its proper divisors (281056983200).

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

128985804640 is a wasteful number, since it uses less digits than its factorization.

128985804640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 128985804640 in words is "one hundred twenty-eight billion, nine hundred eighty-five million, eight hundred four thousand, six hundred forty".