128144685 has 8 divisors (see below), whose sum is σ = 205031520. Its totient is φ = 68343824.

The previous prime is 128144677. The next prime is 128144719. The reversal of 128144685 is 586441821.

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 128144685 - 2³ = 128144677 is a prime.

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, 4271475 + ... + 4271504.

It is an arithmetic number, because the mean of its divisors is an integer number (25628940).

Almost surely, 2^128144685 is an apocalyptic number.

128144685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128144685 is a deficient number, since it is larger than the sum of its proper divisors (76886835).

128144685 is an equidigital number, since it uses as much as digits as its factorization.

128144685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8542987.

The product of its digits is 61440, while the sum is 39.

The square root of 128144685 is about 11320.1009271119. The cubic root of 128144685 is about 504.1582356201.

The spelling of 128144685 in words is "one hundred twenty-eight million, one hundred forty-four thousand, six hundred eighty-five".