128941680 has 320 divisors, whose sum is σ = 493682688. Its totient is φ = 27202560.

The previous prime is 128941663. The next prime is 128941691. The reversal of 128941680 is 86149821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1816045 + ... + 1816115.

Almost surely, 2^128941680 is an apocalyptic number.

128941680 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 128941680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246841344).

128941680 is an abundant number, since it is smaller than the sum of its proper divisors (364741008).

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

128941680 is a wasteful number, since it uses less digits than its factorization.

128941680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 128941680 is about 11355.2490065168. The cubic root of 128941680 is about 505.2012791089.

The spelling of 128941680 in words is "one hundred twenty-eight million, nine hundred forty-one thousand, six hundred eighty".