128403664 has 20 divisors (see below), whose sum is σ = 259599456. Its totient is φ = 61410272.

The previous prime is 128403659. The next prime is 128403679. The reversal of 128403664 is 466304821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174094 + ... + 174829.

Almost surely, 2^128403664 is an apocalyptic number.

It is an amenable number.

128403664 is an abundant number, since it is smaller than the sum of its proper divisors (131195792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128403664 is a wasteful number, since it uses less digits than its factorization.

128403664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348954 (or 348948 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 128403664 is about 11331.5340532516. The cubic root of 128403664 is about 504.4976398297.

The spelling of 128403664 in words is "one hundred twenty-eight million, four hundred three thousand, six hundred sixty-four".