128928385 has 8 divisors (see below), whose sum is σ = 155448576. Its totient is φ = 102653040.

The previous prime is 128928377. The next prime is 128928407. The reversal of 128928385 is 583829821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128928385 - 2³ = 128928377 is a prime.

It is a Duffinian 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, 60049 + ... + 62158.

It is an arithmetic number, because the mean of its divisors is an integer number (19431072).

Almost surely, 2^128928385 is an apocalyptic number.

It is an amenable number.

128928385 is a deficient number, since it is larger than the sum of its proper divisors (26520191).

128928385 is a wasteful number, since it uses less digits than its factorization.

128928385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122423.

The product of its digits is 276480, while the sum is 46.

The square root of 128928385 is about 11354.6635793404. The cubic root of 128928385 is about 505.1839149748.

The spelling of 128928385 in words is "one hundred twenty-eight million, nine hundred twenty-eight thousand, three hundred eighty-five".