128125864 has 16 divisors (see below), whose sum is σ = 244175220. Its totient is φ = 63012480.

The previous prime is 128125859. The next prime is 128125919. The reversal of 128125864 is 468521821.

It can be written as a sum of positive squares in 2 ways, for example, as 127916100 + 209764 = 11310^2 + 458^2 .

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, 130789 + ... + 131764.

Almost surely, 2^128125864 is an apocalyptic number.

It is an amenable number.

128125864 is a deficient number, since it is larger than the sum of its proper divisors (116049356).

128125864 is a wasteful number, since it uses less digits than its factorization.

128125864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262620 (or 262616 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 128125864 is about 11319.2695877428. The cubic root of 128125864 is about 504.1335519933.

The spelling of 128125864 in words is "one hundred twenty-eight million, one hundred twenty-five thousand, eight hundred sixty-four".