128453728 has 72 divisors (see below), whose sum is σ = 280497168. Its totient is φ = 57560832.

The previous prime is 128453713. The next prime is 128453747. The reversal of 128453728 is 827354821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 769101 + ... + 769267.

It is an arithmetic number, because the mean of its divisors is an integer number (3895794).

Almost surely, 2^128453728 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 128453728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140248584).

128453728 is an abundant number, since it is smaller than the sum of its proper divisors (152043440).

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

128453728 is a wasteful number, since it uses less digits than its factorization.

128453728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 225 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 128453728 is about 11333.7428945605. The cubic root of 128453728 is about 504.5631984158.

The spelling of 128453728 in words is "one hundred twenty-eight million, four hundred fifty-three thousand, seven hundred twenty-eight".