128605920 has 48 divisors (see below), whose sum is σ = 405110160. Its totient is φ = 34294784.

The previous prime is 128605877. The next prime is 128605933. The reversal of 128605920 is 29506821.

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

It is a congruent number.

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, 133485 + ... + 134444.

It is an arithmetic number, because the mean of its divisors is an integer number (8439795).

Almost surely, 2^128605920 is an apocalyptic number.

128605920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128605920 is an abundant number, since it is smaller than the sum of its proper divisors (276504240).

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

128605920 is a wasteful number, since it uses less digits than its factorization.

128605920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267947 (or 267939 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 128605920 is about 11340.4550173262. The cubic root of 128605920 is about 504.7623886257.

Subtracting from 128605920 its reverse (29506821), we obtain a palindrome (99099099).

The spelling of 128605920 in words is "one hundred twenty-eight million, six hundred five thousand, nine hundred twenty".