128775249 has 12 divisors (see below), whose sum is σ = 187748496. Its totient is φ = 85047192.

The previous prime is 128775233. The next prime is 128775307. The reversal of 128775249 is 942577821.

It is a happy number.

It is not a de Polignac number, because 128775249 - 2⁴ = 128775233 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128775149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65899 + ... + 67824.

It is an arithmetic number, because the mean of its divisors is an integer number (15645708).

Almost surely, 2^128775249 is an apocalyptic number.

It is an amenable number.

128775249 is a deficient number, since it is larger than the sum of its proper divisors (58973247).

128775249 is a wasteful number, since it uses less digits than its factorization.

128775249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133836 (or 133833 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 128775249 is about 11347.9182672418. The cubic root of 128775249 is about 504.9838232899.

The spelling of 128775249 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, two hundred forty-nine".