128207915 has 32 divisors (see below), whose sum is σ = 179020800. Its totient is φ = 87160320.

The previous prime is 128207881. The next prime is 128207921. The reversal of 128207915 is 519702821.

It is not a de Polignac number, because 128207915 - 2⁶ = 128207851 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81779 + ... + 83331.

It is an arithmetic number, because the mean of its divisors is an integer number (5594400).

Almost surely, 2^128207915 is an apocalyptic number.

128207915 is a deficient number, since it is larger than the sum of its proper divisors (50812885).

128207915 is a wasteful number, since it uses less digits than its factorization.

128207915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 128207915 is about 11322.8934023067. The cubic root of 128207915 is about 504.2411436849.

The spelling of 128207915 in words is "one hundred twenty-eight million, two hundred seven thousand, nine hundred fifteen".