128604407 has 4 divisors (see below), whose sum is σ = 135373080. Its totient is φ = 121835736.

The previous prime is 128604389. The next prime is 128604451. The reversal of 128604407 is 704406821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128604407 - 2¹⁴ = 128588023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128606407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384308 + ... + 3384345.

It is an arithmetic number, because the mean of its divisors is an integer number (33843270).

Almost surely, 2^128604407 is an apocalyptic number.

128604407 is a deficient number, since it is larger than the sum of its proper divisors (6768673).

128604407 is an equidigital number, since it uses as much as digits as its factorization.

128604407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6768672.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 128604407 is about 11340.3883090483. The cubic root of 128604407 is about 504.7604091717.

The spelling of 128604407 in words is "one hundred twenty-eight million, six hundred four thousand, four hundred seven".