128784578 has 16 divisors (see below), whose sum is σ = 209420736. Its totient is φ = 59043600.

The previous prime is 128784569. The next prime is 128784581. The reversal of 128784578 is 875487821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12476 + ... + 20327.

It is an arithmetic number, because the mean of its divisors is an integer number (13088796).

Almost surely, 2^128784578 is an apocalyptic number.

128784578 is a deficient number, since it is larger than the sum of its proper divisors (80636158).

128784578 is a wasteful number, since it uses less digits than its factorization.

128784578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32969.

The product of its digits is 1003520, while the sum is 50.

The square root of 128784578 is about 11348.3293043514. The cubic root of 128784578 is about 504.9960173525.

The spelling of 128784578 in words is "one hundred twenty-eight million, seven hundred eighty-four thousand, five hundred seventy-eight".