128356728 has 16 divisors (see below), whose sum is σ = 320891880. Its totient is φ = 42785568.

The previous prime is 128356717. The next prime is 128356747. The reversal of 128356728 is 827653821.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 128356728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2674075 + ... + 2674122.

Almost surely, 2^128356728 is an apocalyptic number.

It is an amenable number.

128356728 is an abundant number, since it is smaller than the sum of its proper divisors (192535152).

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

128356728 is a wasteful number, since it uses less digits than its factorization.

128356728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348206 (or 5348202 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 128356728 is about 11329.4628292784. The cubic root of 128356728 is about 504.4361618670.

The spelling of 128356728 in words is "one hundred twenty-eight million, three hundred fifty-six thousand, seven hundred twenty-eight".