128350643 has 4 divisors (see below), whose sum is σ = 135105960. Its totient is φ = 121595328.

The previous prime is 128350639. The next prime is 128350687. The reversal of 128350643 is 346053821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128350643 - 2² = 128350639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128350693) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3377630 + ... + 3377667.

It is an arithmetic number, because the mean of its divisors is an integer number (33776490).

Almost surely, 2^128350643 is an apocalyptic number.

128350643 is a deficient number, since it is larger than the sum of its proper divisors (6755317).

128350643 is an equidigital number, since it uses as much as digits as its factorization.

128350643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755316.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 128350643 is about 11329.1942785001. The cubic root of 128350643 is about 504.4281904823.

The spelling of 128350643 in words is "one hundred twenty-eight million, three hundred fifty thousand, six hundred forty-three".