128778294 has 16 divisors (see below), whose sum is σ = 263838960. Its totient is φ = 41879040.

The previous prime is 128778289. The next prime is 128778317. The reversal of 128778294 is 492877821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261499 + ... + 261990.

It is an arithmetic number, because the mean of its divisors is an integer number (16489935).

Almost surely, 2^128778294 is an apocalyptic number.

128778294 is an abundant number, since it is smaller than the sum of its proper divisors (135060666).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128778294 is a wasteful number, since it uses less digits than its factorization.

128778294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523535.

The product of its digits is 451584, while the sum is 48.

The square root of 128778294 is about 11348.0524320255. The cubic root of 128778294 is about 504.9878035155.

The spelling of 128778294 in words is "one hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred ninety-four".