128779295 has 16 divisors (see below), whose sum is σ = 158578560. Its totient is φ = 100349184.

The previous prime is 128779279. The next prime is 128779307. The reversal of 128779295 is 592977821.

It is a cyclic number.

It is not a de Polignac number, because 128779295 - 2⁴ = 128779279 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52619 + ... + 55011.

It is an arithmetic number, because the mean of its divisors is an integer number (9911160).

Almost surely, 2^128779295 is an apocalyptic number.

128779295 is a deficient number, since it is larger than the sum of its proper divisors (29799265).

128779295 is a wasteful number, since it uses less digits than its factorization.

128779295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674.

The product of its digits is 635040, while the sum is 50.

The square root of 128779295 is about 11348.0965364241. The cubic root of 128779295 is about 504.9891119438.

The spelling of 128779295 in words is "one hundred twenty-eight million, seven hundred seventy-nine thousand, two hundred ninety-five".