128040864 has 48 divisors (see below), whose sum is σ = 384124608. Its totient is φ = 36582912.

The previous prime is 128040859. The next prime is 128040911. The reversal of 128040864 is 468040821.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94597 + ... + 95940.

It is an arithmetic number, because the mean of its divisors is an integer number (8002596).

Almost surely, 2^128040864 is an apocalyptic number.

128040864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

128040864 is an abundant number, since it is smaller than the sum of its proper divisors (256083744).

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

128040864 is a wasteful number, since it uses less digits than its factorization.

128040864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190557 (or 190549 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 128040864 is about 11315.5143055895. The cubic root of 128040864 is about 504.0220448911.

The spelling of 128040864 in words is "one hundred twenty-eight million, forty thousand, eight hundred sixty-four".