128305960 has 64 divisors (see below), whose sum is σ = 304819200. Its totient is φ = 48508416.

The previous prime is 128305927. The next prime is 128305979. The reversal of 128305960 is 69503821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81097 + ... + 82663.

It is an arithmetic number, because the mean of its divisors is an integer number (4762800).

Almost surely, 2^128305960 is an apocalyptic number.

128305960 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 128305960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152409600).

128305960 is an abundant number, since it is smaller than the sum of its proper divisors (176513240).

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

128305960 is a wasteful number, since it uses less digits than its factorization.

128305960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 128305960 is about 11327.2220778088. Note that the first 3 decimals coincide. The cubic root of 128305960 is about 504.3696477789.

The spelling of 128305960 in words is "one hundred twenty-eight million, three hundred five thousand, nine hundred sixty".