128775388 has 24 divisors (see below), whose sum is σ = 271107200. Its totient is φ = 52284528.

The previous prime is 128775377. The next prime is 128775397. The reversal of 128775388 is 883577821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120498 + ... + 121561.

Almost surely, 2^128775388 is an apocalyptic number.

It is an amenable number.

128775388 is an abundant number, since it is smaller than the sum of its proper divisors (142331812).

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

128775388 is a wasteful number, since it uses less digits than its factorization.

128775388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242089 (or 242087 counting only the distinct ones).

The product of its digits is 752640, while the sum is 49.

The square root of 128775388 is about 11347.9243917115. The cubic root of 128775388 is about 504.9840049830.

The spelling of 128775388 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, three hundred eighty-eight".