128966256 has 100 divisors (see below), whose sum is σ = 375940224. Its totient is φ = 42681600.

The previous prime is 128966249. The next prime is 128966263. The reversal of 128966256 is 652669821.

128966256 is a `hidden beast` number, since 12 + 8 + 9 + 6 + 625 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (128966249) and next prime (128966263).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 247276 + ... + 247796.

Almost surely, 2^128966256 is an apocalyptic number.

128966256 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 128966256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187970112).

128966256 is an abundant number, since it is smaller than the sum of its proper divisors (246973968).

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

128966256 is a wasteful number, since it uses less digits than its factorization.

128966256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732 (or 717 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 128966256 is about 11356.3310976741. The cubic root of 128966256 is about 505.2333738200.

The spelling of 128966256 in words is "one hundred twenty-eight million, nine hundred sixty-six thousand, two hundred fifty-six".