128555307 has 12 divisors (see below), whose sum is σ = 185790384. Its totient is φ = 85657680.

The previous prime is 128555281. The next prime is 128555327. The reversal of 128555307 is 703555821.

It is not a de Polignac number, because 128555307 - 2¹⁴ = 128538923 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (128555327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27082 + ... + 31472.

It is an arithmetic number, because the mean of its divisors is an integer number (15482532).

Almost surely, 2^128555307 is an apocalyptic number.

128555307 is a deficient number, since it is larger than the sum of its proper divisors (57235077).

128555307 is a wasteful number, since it uses less digits than its factorization.

128555307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7650 (or 7647 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The square root of 128555307 is about 11338.2232735116. The cubic root of 128555307 is about 504.6961633411.

The spelling of 128555307 in words is "one hundred twenty-eight million, five hundred fifty-five thousand, three hundred seven".