128350728 has 48 divisors (see below), whose sum is σ = 379220400. Its totient is φ = 38893920.

The previous prime is 128350721. The next prime is 128350751. The reversal of 128350728 is 827053821.

128350728 is a `hidden beast` number, since 128 + 3 + 507 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 3.

It is a junction number, because it is equal to n+sod(n) for n = 128350692 and 128350701.

It is not an unprimeable number, because it can be changed into a prime (128350721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80238 + ... + 81821.

It is an arithmetic number, because the mean of its divisors is an integer number (7900425).

Almost surely, 2^128350728 is an apocalyptic number.

128350728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128350728 is an abundant number, since it is smaller than the sum of its proper divisors (250869672).

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

128350728 is a wasteful number, since it uses less digits than its factorization.

128350728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162082 (or 162075 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 128350728 is about 11329.1980298695. The cubic root of 128350728 is about 504.4283018346.

The spelling of 128350728 in words is "one hundred twenty-eight million, three hundred fifty thousand, seven hundred twenty-eight".