128878656 has 112 divisors (see below), whose sum is σ = 358932480. Its totient is φ = 40757760.

The previous prime is 128878627. The next prime is 128878693. The reversal of 128878656 is 656878821.

It is a junction number, because it is equal to n+sod(n) for n = 128878599 and 128878608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350985 + ... + 351351.

Almost surely, 2^128878656 is an apocalyptic number.

128878656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179466240).

128878656 is an abundant number, since it is smaller than the sum of its proper divisors (230053824).

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

128878656 is a wasteful number, since it uses less digits than its factorization.

128878656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472 (or 462 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The square root of 128878656 is about 11352.4735630610. The cubic root of 128878656 is about 505.1189550836.

The spelling of 128878656 in words is "one hundred twenty-eight million, eight hundred seventy-eight thousand, six hundred fifty-six".