128784878 has 8 divisors (see below), whose sum is σ = 193242672. Its totient is φ = 64370656.

The previous prime is 128784823. The next prime is 128784883. The reversal of 128784878 is 878487821.

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

It is a congruent number.

It is an unprimeable number.

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, 2075 + ... + 16182.

It is an arithmetic number, because the mean of its divisors is an integer number (24155334).

Almost surely, 2^128784878 is an apocalyptic number.

128784878 is a deficient number, since it is larger than the sum of its proper divisors (64457794).

128784878 is a wasteful number, since it uses less digits than its factorization.

128784878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21786.

The product of its digits is 1605632, while the sum is 53.

The square root of 128784878 is about 11348.3425221483. The cubic root of 128784878 is about 504.9964094768.

The spelling of 128784878 in words is "one hundred twenty-eight million, seven hundred eighty-four thousand, eight hundred seventy-eight".