128220819720864 has 96 divisors (see below), whose sum is σ = 365857968369600. Its totient is φ = 39083844360192.

The previous prime is 128220819720823. The next prime is 128220819720911. The reversal of 128220819720864 is 468027918022821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 128220819720798 and 128220819720807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 479964789 + ... + 480231860.

It is an arithmetic number, because the mean of its divisors is an integer number (3811020503850).

Almost surely, 2^{128220819720864} is an apocalyptic number.

It is an amenable number.

128220819720864 is an abundant number, since it is smaller than the sum of its proper divisors (237637148648736).

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

128220819720864 is a wasteful number, since it uses less digits than its factorization.

128220819720864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960196782 (or 960196774 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 60.

The spelling of 128220819720864 in words is "one hundred twenty-eight trillion, two hundred twenty billion, eight hundred nineteen million, seven hundred twenty thousand, eight hundred sixty-four".