128478117 has 8 divisors (see below), whose sum is σ = 172537120. Its totient is φ = 85035600.

The previous prime is 128478113. The next prime is 128478127. The reversal of 128478117 is 711874821.

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

It is not a de Polignac number, because 128478117 - 2² = 128478113 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128478113) 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, 153634 + ... + 154467.

It is an arithmetic number, because the mean of its divisors is an integer number (21567140).

Almost surely, 2^128478117 is an apocalyptic number.

It is an amenable number.

128478117 is a deficient number, since it is larger than the sum of its proper divisors (44059003).

128478117 is a wasteful number, since it uses less digits than its factorization.

128478117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308243.

The product of its digits is 25088, while the sum is 39.

The square root of 128478117 is about 11334.8187899057. The cubic root of 128478117 is about 504.5951295330.

It can be divided in two parts, 1284 and 78117, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 128478117 in words is "one hundred twenty-eight million, four hundred seventy-eight thousand, one hundred seventeen".