128371980 has 192 divisors, whose sum is σ = 428198400. Its totient is φ = 28385280.

The previous prime is 128371979. The next prime is 128371987. The reversal of 128371980 is 89173821.

It is not an unprimeable number, because it can be changed into a prime (128371987) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 363484 + ... + 363836.

It is an arithmetic number, because the mean of its divisors is an integer number (2230200).

Almost surely, 2^128371980 is an apocalyptic number.

128371980 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 128371980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214099200).

128371980 is an abundant number, since it is smaller than the sum of its proper divisors (299826420).

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

128371980 is a wasteful number, since it uses less digits than its factorization.

128371980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 128371980 is about 11330.1359215148. The cubic root of 128371980 is about 504.4561409668.

The spelling of 128371980 in words is "one hundred twenty-eight million, three hundred seventy-one thousand, nine hundred eighty".