128139168 has 48 divisors (see below), whose sum is σ = 347971680. Its totient is φ = 41239296.

The previous prime is 128139157. The next prime is 128139181. The reversal of 128139168 is 861931821.

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, 20230 + ... + 25797.

It is an arithmetic number, because the mean of its divisors is an integer number (7249410).

Almost surely, 2^128139168 is an apocalyptic number.

It is an amenable number.

128139168 is an abundant number, since it is smaller than the sum of its proper divisors (219832512).

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

128139168 is a wasteful number, since it uses less digits than its factorization.

128139168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46069 (or 46061 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 128139168 is about 11319.8572429161. The cubic root of 128139168 is about 504.1510003586.

The spelling of 128139168 in words is "one hundred twenty-eight million, one hundred thirty-nine thousand, one hundred sixty-eight".