128638278912 has 324 divisors, whose sum is σ = 407543119872. Its totient is φ = 35978342400.

The previous prime is 128638278833. The next prime is 128638278919. The reversal of 128638278912 is 219872836821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128638278919) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15700737 + ... + 15708927.

Almost surely, 2^128638278912 is an apocalyptic number.

128638278912 is a gapful number since it is divisible by the number (12) 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 128638278912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203771559936).

128638278912 is an abundant number, since it is smaller than the sum of its proper divisors (278904840960).

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

128638278912 is a wasteful number, since it uses less digits than its factorization.

128638278912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8258 (or 8220 counting only the distinct ones).

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

The spelling of 128638278912 in words is "one hundred twenty-eight billion, six hundred thirty-eight million, two hundred seventy-eight thousand, nine hundred twelve".