128778091008 has 320 divisors, whose sum is σ = 428557713408. Its totient is φ = 33510850560.

The previous prime is 128778090937. The next prime is 128778091019. The reversal of 128778091008 is 800190877821.

128778091008 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 (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5654941 + ... + 5677667.

Almost surely, 2^128778091008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128778091008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214278856704).

128778091008 is an abundant number, since it is smaller than the sum of its proper divisors (299779622400).

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

128778091008 is a wasteful number, since it uses less digits than its factorization.

128778091008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22803 (or 22787 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 128778091008 in words is "one hundred twenty-eight billion, seven hundred seventy-eight million, ninety-one thousand, eight".