128178789 has 8 divisors (see below), whose sum is σ = 171091200. Its totient is φ = 85359456.

The previous prime is 128178761. The next prime is 128178803. The reversal of 128178789 is 987871821.

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

It is not a de Polignac number, because 128178789 - 2¹⁶ = 128113253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128178709) 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, 19989 + ... + 25610.

It is an arithmetic number, because the mean of its divisors is an integer number (21386400).

Almost surely, 2^128178789 is an apocalyptic number.

It is an amenable number.

128178789 is a deficient number, since it is larger than the sum of its proper divisors (42912411).

128178789 is an equidigital number, since it uses as much as digits as its factorization.

128178789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46539.

The product of its digits is 451584, while the sum is 51.

The square root of 128178789 is about 11321.6071738954. The cubic root of 128178789 is about 504.2029566513.

The spelling of 128178789 in words is "one hundred twenty-eight million, one hundred seventy-eight thousand, seven hundred eighty-nine".