128479717 has 16 divisors (see below), whose sum is σ = 136857600. Its totient is φ = 120424320.

The previous prime is 128479711. The next prime is 128479721. The reversal of 128479717 is 717974821.

It is a cyclic number.

It is not a de Polignac number, because 128479717 - 2¹¹ = 128477669 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 (128479711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158409 + ... + 159217.

It is an arithmetic number, because the mean of its divisors is an integer number (8553600).

Almost surely, 2^128479717 is an apocalyptic number.

It is an amenable number.

128479717 is a deficient number, since it is larger than the sum of its proper divisors (8377883).

128479717 is a wasteful number, since it uses less digits than its factorization.

128479717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

The product of its digits is 197568, while the sum is 46.

The square root of 128479717 is about 11334.8893686705. The cubic root of 128479717 is about 504.5972241798.

The spelling of 128479717 in words is "one hundred twenty-eight million, four hundred seventy-nine thousand, seven hundred seventeen".