128643369 has 8 divisors (see below), whose sum is σ = 181614240. Its totient is φ = 80717376.

The previous prime is 128643343. The next prime is 128643379. The reversal of 128643369 is 963346821.

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

It is not a de Polignac number, because 128643369 - 2⁵ = 128643337 is a prime.

It is a super-2 number, since 2×128643369² = 33098232775340322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128643369.

It is not an unprimeable number, because it can be changed into a prime (128643329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261159 + ... + 1261260.

It is an arithmetic number, because the mean of its divisors is an integer number (22701780).

Almost surely, 2^128643369 is an apocalyptic number.

It is an amenable number.

128643369 is a deficient number, since it is larger than the sum of its proper divisors (52970871).

128643369 is a wasteful number, since it uses less digits than its factorization.

128643369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522439.

The product of its digits is 186624, while the sum is 42.

The square root of 128643369 is about 11342.1060213701. The cubic root of 128643369 is about 504.8113781076.

The spelling of 128643369 in words is "one hundred twenty-eight million, six hundred forty-three thousand, three hundred sixty-nine".