128346643 has 8 divisors (see below), whose sum is σ = 129927168. Its totient is φ = 126774144.

The previous prime is 128346641. The next prime is 128346649. The reversal of 128346643 is 346643821.

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 128346643 - 2¹ = 128346641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128346641) 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, 34030 + ... + 37612.

It is an arithmetic number, because the mean of its divisors is an integer number (16240896).

Almost surely, 2^128346643 is an apocalyptic number.

128346643 is a deficient number, since it is larger than the sum of its proper divisors (1580525).

128346643 is a wasteful number, since it uses less digits than its factorization.

128346643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4013.

The product of its digits is 82944, while the sum is 37.

The square root of 128346643 is about 11329.0177420640. The cubic root of 128346643 is about 504.4229503223.

The spelling of 128346643 in words is "one hundred twenty-eight million, three hundred forty-six thousand, six hundred forty-three".