128394756 has 72 divisors (see below), whose sum is σ = 373726080. Its totient is φ = 36406656.

The previous prime is 128394751. The next prime is 128394811. The reversal of 128394756 is 657493821.

It is not an unprimeable number, because it can be changed into a prime (128394751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32665 + ... + 36383.

It is an arithmetic number, because the mean of its divisors is an integer number (5190640).

Almost surely, 2^128394756 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 128394756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186863040).

128394756 is an abundant number, since it is smaller than the sum of its proper divisors (245331324).

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

128394756 is a wasteful number, since it uses less digits than its factorization.

128394756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3873 (or 3868 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 128394756 is about 11331.1409840316. The cubic root of 128394756 is about 504.4859730574.

It can be divided in two parts, 1283947 and 56, that added together give a triangular number (1284003 = T₁₆₀₂).

The spelling of 128394756 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, seven hundred fifty-six".