128863656 has 64 divisors (see below), whose sum is σ = 366710400. Its totient is φ = 41904000.

The previous prime is 128863649. The next prime is 128863661. The reversal of 128863656 is 656368821.

128863656 is a `hidden beast` number, since 1 + 2 + 8 + 8 + 636 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1581 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (5729850).

Almost surely, 2^128863656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128863656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183355200).

128863656 is an abundant number, since it is smaller than the sum of its proper divisors (237846744).

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

128863656 is a wasteful number, since it uses less digits than its factorization.

128863656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14607 (or 14597 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 128863656 is about 11351.8128948640. The cubic root of 128863656 is about 505.0993576356.

The spelling of 128863656 in words is "one hundred twenty-eight million, eight hundred sixty-three thousand, six hundred fifty-six".