128364665 has 48 divisors (see below), whose sum is σ = 192158400. Its totient is φ = 81544320.

The previous prime is 128364631. The next prime is 128364667. The reversal of 128364665 is 566463821.

It is not a de Polignac number, because 128364665 - 2⁶ = 128364601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128364667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149006 + ... + 149864.

It is an arithmetic number, because the mean of its divisors is an integer number (4003300).

Almost surely, 2^128364665 is an apocalyptic number.

It is an amenable number.

128364665 is a deficient number, since it is larger than the sum of its proper divisors (63793735).

128364665 is a wasteful number, since it uses less digits than its factorization.

128364665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 907 counting only the distinct ones).

The product of its digits is 207360, while the sum is 41.

The square root of 128364665 is about 11329.8131052546. The cubic root of 128364665 is about 504.4465590036.

The spelling of 128364665 in words is "one hundred twenty-eight million, three hundred sixty-four thousand, six hundred sixty-five".