128778915279 has 32 divisors (see below), whose sum is σ = 211827409920. Its totient is φ = 67961279232.

The previous prime is 128778915257. The next prime is 128778915311. The reversal of 128778915279 is 972519877821.

It is not a de Polignac number, because 128778915279 - 2⁵ = 128778915247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128778915079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4582942 + ... + 4610955.

It is an arithmetic number, because the mean of its divisors is an integer number (6619606560).

Almost surely, 2^128778915279 is an apocalyptic number.

128778915279 is a deficient number, since it is larger than the sum of its proper divisors (83048494641).

128778915279 is a wasteful number, since it uses less digits than its factorization.

128778915279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9193959.

The product of its digits is 35562240, while the sum is 66.

The spelling of 128778915279 in words is "one hundred twenty-eight billion, seven hundred seventy-eight million, nine hundred fifteen thousand, two hundred seventy-nine".