128858585 has 8 divisors (see below), whose sum is σ = 154905480. Its totient is φ = 102903424.

The previous prime is 128858567. The next prime is 128858617. The reversal of 128858585 is 585858821.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 123232201 = 2372^2 + 11101^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128858585 - 2¹² = 128854489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19802 + ... + 25491.

It is an arithmetic number, because the mean of its divisors is an integer number (19363185).

Almost surely, 2^128858585 is an apocalyptic number.

It is an amenable number.

128858585 is a deficient number, since it is larger than the sum of its proper divisors (26046895).

128858585 is an equidigital number, since it uses as much as digits as its factorization.

128858585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45867.

The product of its digits is 1024000, while the sum is 50.

The square root of 128858585 is about 11351.5895362720. The cubic root of 128858585 is about 505.0927320477.

The spelling of 128858585 in words is "one hundred twenty-eight million, eight hundred fifty-eight thousand, five hundred eighty-five".