128199720 has 256 divisors, whose sum is σ = 461894400. Its totient is φ = 28098560.

The previous prime is 128199697. The next prime is 128199733. The reversal of 128199720 is 27991821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 650662 + ... + 650858.

It is an arithmetic number, because the mean of its divisors is an integer number (1804275).

Almost surely, 2^128199720 is an apocalyptic number.

128199720 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 128199720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230947200).

128199720 is an abundant number, since it is smaller than the sum of its proper divisors (333694680).

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

128199720 is a wasteful number, since it uses less digits than its factorization.

128199720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 128199720 is about 11322.5315190553. The cubic root of 128199720 is about 504.2303998234.

The spelling of 128199720 in words is "one hundred twenty-eight million, one hundred ninety-nine thousand, seven hundred twenty".