128755616 has 48 divisors (see below), whose sum is σ = 278909568. Its totient is φ = 58505920.

The previous prime is 128755591. The next prime is 128755643. The reversal of 128755616 is 616557821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41081 + ... + 44103.

It is an arithmetic number, because the mean of its divisors is an integer number (5810616).

Almost surely, 2^128755616 is an apocalyptic number.

128755616 is a gapful number since it is divisible by the number (16) 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 128755616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139454784).

128755616 is an abundant number, since it is smaller than the sum of its proper divisors (150153952).

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

128755616 is an equidigital number, since it uses as much as digits as its factorization.

128755616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066 (or 3036 counting only the distinct ones).

The product of its digits is 100800, while the sum is 41.

The square root of 128755616 is about 11347.0531857395. The cubic root of 128755616 is about 504.9581588051.

The spelling of 128755616 in words is "one hundred twenty-eight million, seven hundred fifty-five thousand, six hundred sixteen".