128775393 has 8 divisors (see below), whose sum is σ = 190778400. Its totient is φ = 85850244.

The previous prime is 128775377. The next prime is 128775397. The reversal of 128775393 is 393577821.

It is a happy number.

It is not a de Polignac number, because 128775393 - 2⁴ = 128775377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128775397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2384703 + ... + 2384756.

It is an arithmetic number, because the mean of its divisors is an integer number (23847300).

Almost surely, 2^128775393 is an apocalyptic number.

It is an amenable number.

128775393 is a deficient number, since it is larger than the sum of its proper divisors (62003007).

128775393 is an equidigital number, since it uses as much as digits as its factorization.

128775393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4769468 (or 4769462 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 128775393 is about 11347.9246120161. The cubic root of 128775393 is about 504.9840115188.

The spelling of 128775393 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, three hundred ninety-three".