128617885 has 8 divisors (see below), whose sum is σ = 168372576. Its totient is φ = 93540240.

The previous prime is 128617873. The next prime is 128617891. The reversal of 128617885 is 588716821.

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

It is not a de Polignac number, because 128617885 - 2⁷ = 128617757 is a prime.

It is a Duffinian number.

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, 1169199 + ... + 1169308.

It is an arithmetic number, because the mean of its divisors is an integer number (21046572).

Almost surely, 2^128617885 is an apocalyptic number.

It is an amenable number.

128617885 is a deficient number, since it is larger than the sum of its proper divisors (39754691).

128617885 is a wasteful number, since it uses less digits than its factorization.

128617885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338523.

The product of its digits is 215040, while the sum is 46.

The square root of 128617885 is about 11340.9825412087. The cubic root of 128617885 is about 504.7780418571.

The spelling of 128617885 in words is "one hundred twenty-eight million, six hundred seventeen thousand, eight hundred eighty-five".