128775279 has 8 divisors (see below), whose sum is σ = 172074672. Its totient is φ = 85663040.

The previous prime is 128775233. The next prime is 128775307. The reversal of 128775279 is 972577821.

It is a happy number.

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 128775279 - 2⁷ = 128775151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128775679) 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, 45174 + ... + 47939.

It is an arithmetic number, because the mean of its divisors is an integer number (21509334).

Almost surely, 2^128775279 is an apocalyptic number.

128775279 is a deficient number, since it is larger than the sum of its proper divisors (43299393).

128775279 is an equidigital number, since it uses as much as digits as its factorization.

128775279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93577.

The product of its digits is 493920, while the sum is 48.

The square root of 128775279 is about 11347.9195890701. The cubic root of 128775279 is about 504.9838625043.

The spelling of 128775279 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, two hundred seventy-nine".