128609306 has 8 divisors (see below), whose sum is σ = 220473120. Its totient is φ = 55118268.

The previous prime is 128609303. The next prime is 128609311. The reversal of 128609306 is 603906821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128609303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4593176 + ... + 4593203.

It is an arithmetic number, because the mean of its divisors is an integer number (27559140).

Almost surely, 2^128609306 is an apocalyptic number.

128609306 is a deficient number, since it is larger than the sum of its proper divisors (91863814).

128609306 is an equidigital number, since it uses as much as digits as its factorization.

128609306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186388.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 128609306 is about 11340.6043048860. The cubic root of 128609306 is about 504.7668184644.

The spelling of 128609306 in words is "one hundred twenty-eight million, six hundred nine thousand, three hundred six".