128378316780 has 144 divisors (see below), whose sum is σ = 445263174720. Its totient is φ = 29329219584.

The previous prime is 128378316779. The next prime is 128378316811. The reversal of 128378316780 is 87613873821.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2658612 + ... + 2706468.

It is an arithmetic number, because the mean of its divisors is an integer number (3092105380).

Almost surely, 2^128378316780 is an apocalyptic number.

128378316780 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 128378316780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222631587360).

128378316780 is an abundant number, since it is smaller than the sum of its proper divisors (316884857940).

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

128378316780 is a wasteful number, since it uses less digits than its factorization.

128378316780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50008 (or 50003 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 128378316780 in words is "one hundred twenty-eight billion, three hundred seventy-eight million, three hundred sixteen thousand, seven hundred eighty".