128257120 has 24 divisors (see below), whose sum is σ = 303007824. Its totient is φ = 51302784.

The previous prime is 128257117. The next prime is 128257121. The reversal of 128257120 is 21752821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128257121) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 400644 + ... + 400963.

It is an arithmetic number, because the mean of its divisors is an integer number (12625326).

Almost surely, 2^128257120 is an apocalyptic number.

128257120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128257120 is an abundant number, since it is smaller than the sum of its proper divisors (174750704).

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

128257120 is an equidigital number, since it uses as much as digits as its factorization.

128257120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801622 (or 801614 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 128257120 is about 11325.0660042227. The cubic root of 128257120 is about 504.3056431142.

The spelling of 128257120 in words is "one hundred twenty-eight million, two hundred fifty-seven thousand, one hundred twenty".