128419856 has 40 divisors (see below), whose sum is σ = 268030464. Its totient is φ = 59431680.

The previous prime is 128419847. The next prime is 128419873. The reversal of 128419856 is 658914821.

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 7 ways as a sum of consecutive naturals, for example, 5780 + ... + 17036.

Almost surely, 2^128419856 is an apocalyptic number.

128419856 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 128419856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134015232).

128419856 is an abundant number, since it is smaller than the sum of its proper divisors (139610608).

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

128419856 is a wasteful number, since it uses less digits than its factorization.

128419856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11319 (or 11313 counting only the distinct ones).

The product of its digits is 138240, while the sum is 44.

The square root of 128419856 is about 11332.2484970989. The cubic root of 128419856 is about 504.5188450460.

The spelling of 128419856 in words is "one hundred twenty-eight million, four hundred nineteen thousand, eight hundred fifty-six".