128189667 has 8 divisors (see below), whose sum is σ = 172167696. Its totient is φ = 84835712.

The previous prime is 128189641. The next prime is 128189687. The reversal of 128189667 is 766981821.

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 128189667 - 2¹⁶ = 128124131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128189627) 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, 155538 + ... + 156359.

It is an arithmetic number, because the mean of its divisors is an integer number (21520962).

Almost surely, 2^128189667 is an apocalyptic number.

128189667 is a deficient number, since it is larger than the sum of its proper divisors (43978029).

128189667 is a wasteful number, since it uses less digits than its factorization.

128189667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312037.

The product of its digits is 290304, while the sum is 48.

The square root of 128189667 is about 11322.0875725283. The cubic root of 128189667 is about 504.2172194496.

The spelling of 128189667 in words is "one hundred twenty-eight million, one hundred eighty-nine thousand, six hundred sixty-seven".