128773117320 has 128 divisors (see below), whose sum is σ = 398371184640. Its totient is φ = 33282420480.

The previous prime is 128773117313. The next prime is 128773117321. The reversal of 128773117320 is 23711377821.

It is not an unprimeable number, because it can be changed into a prime (128773117321) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 470085 + ... + 691755.

It is an arithmetic number, because the mean of its divisors is an integer number (3112274880).

Almost surely, 2^128773117320 is an apocalyptic number.

128773117320 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 128773117320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199185592320).

128773117320 is an abundant number, since it is smaller than the sum of its proper divisors (269598067320).

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

128773117320 is a wasteful number, since it uses less digits than its factorization.

128773117320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221835 (or 221831 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The spelling of 128773117320 in words is "one hundred twenty-eight billion, seven hundred seventy-three million, one hundred seventeen thousand, three hundred twenty".