128646678 has 8 divisors (see below), whose sum is σ = 257293368. Its totient is φ = 42882224.

The previous prime is 128646671. The next prime is 128646689. The reversal of 128646678 is 876646821.

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

128646678 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128646671) by changing a digit.

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, 10720551 + ... + 10720562.

It is an arithmetic number, because the mean of its divisors is an integer number (32161671).

Almost surely, 2^128646678 is an apocalyptic number.

128646678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128646678 is a wasteful number, since it uses less digits than its factorization.

128646678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21441118.

The product of its digits is 774144, while the sum is 48.

The square root of 128646678 is about 11342.2518928121. The cubic root of 128646678 is about 504.8157063694.

The spelling of 128646678 in words is "one hundred twenty-eight million, six hundred forty-six thousand, six hundred seventy-eight".