128331720 has 192 divisors, whose sum is σ = 475113600. Its totient is φ = 29736960.

The previous prime is 128331713. The next prime is 128331751. The reversal of 128331720 is 27133821.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 90376 + ... + 91784.

It is an arithmetic number, because the mean of its divisors is an integer number (2474550).

Almost surely, 2^128331720 is an apocalyptic number.

128331720 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 128331720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237556800).

128331720 is an abundant number, since it is smaller than the sum of its proper divisors (346781880).

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

128331720 is a wasteful number, since it uses less digits than its factorization.

128331720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460 (or 1453 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 128331720 is about 11328.3591044776. The cubic root of 128331720 is about 504.4033996345.

The spelling of 128331720 in words is "one hundred twenty-eight million, three hundred thirty-one thousand, seven hundred twenty".