128975479 has 8 divisors (see below), whose sum is σ = 131376960. Its totient is φ = 126593376.

The previous prime is 128975471. The next prime is 128975491. The reversal of 128975479 is 974579821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128975479 - 2³ = 128975471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128975471) 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 7 ways as a sum of consecutive naturals, for example, 8949 + ... + 18385.

It is an arithmetic number, because the mean of its divisors is an integer number (16422120).

Almost surely, 2^128975479 is an apocalyptic number.

128975479 is a deficient number, since it is larger than the sum of its proper divisors (2401481).

128975479 is an equidigital number, since it uses as much as digits as its factorization.

128975479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9689.

The product of its digits is 1270080, while the sum is 52.

The square root of 128975479 is about 11356.7371634638. The cubic root of 128975479 is about 505.2454174260.

The spelling of 128975479 in words is "one hundred twenty-eight million, nine hundred seventy-five thousand, four hundred seventy-nine".