128323657 has 8 divisors (see below), whose sum is σ = 159988032. Its totient is φ = 99992400.

The previous prime is 128323607. The next prime is 128323669. The reversal of 128323657 is 756323821.

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

It is a cyclic number.

It is not a de Polignac number, because 128323657 - 2⁷ = 128323529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128323607) 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 7 ways as a sum of consecutive naturals, for example, 833194 + ... + 833347.

It is an arithmetic number, because the mean of its divisors is an integer number (19998504).

Almost surely, 2^128323657 is an apocalyptic number.

It is an amenable number.

128323657 is a deficient number, since it is larger than the sum of its proper divisors (31664375).

128323657 is a wasteful number, since it uses less digits than its factorization.

128323657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666559.

The product of its digits is 60480, while the sum is 37.

The square root of 128323657 is about 11328.0032221041. The cubic root of 128323657 is about 504.3928356321.

The spelling of 128323657 in words is "one hundred twenty-eight million, three hundred twenty-three thousand, six hundred fifty-seven".