128805585 has 8 divisors (see below), whose sum is σ = 206088960. Its totient is φ = 68696304.

The previous prime is 128805577. The next prime is 128805647. The reversal of 128805585 is 585508821.

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

It is not a de Polignac number, because 128805585 - 2³ = 128805577 is a prime.

It is a Curzon 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, 4293505 + ... + 4293534.

It is an arithmetic number, because the mean of its divisors is an integer number (25761120).

Almost surely, 2^128805585 is an apocalyptic number.

128805585 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128805585 is a deficient number, since it is larger than the sum of its proper divisors (77283375).

128805585 is an equidigital number, since it uses as much as digits as its factorization.

128805585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8587047.

The product of its (nonzero) digits is 128000, while the sum is 42.

The square root of 128805585 is about 11349.2548213528. The cubic root of 128805585 is about 505.0234737316.

The spelling of 128805585 in words is "one hundred twenty-eight million, eight hundred five thousand, five hundred eighty-five".