128878994 has 8 divisors (see below), whose sum is σ = 193801788. Its totient is φ = 64278400.

The previous prime is 128878991. The next prime is 128879021. The reversal of 128878994 is 499878821.

It can be written as a sum of positive squares in 2 ways, for example, as 111028369 + 17850625 = 10537^2 + 4225^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128878991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79547 + ... + 81150.

Almost surely, 2^128878994 is an apocalyptic number.

128878994 is a deficient number, since it is larger than the sum of its proper divisors (64922794).

128878994 is a wasteful number, since it uses less digits than its factorization.

128878994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161100.

The product of its digits is 2322432, while the sum is 56.

The square root of 128878994 is about 11352.4884496748. The cubic root of 128878994 is about 505.1193966619.

The spelling of 128878994 in words is "one hundred twenty-eight million, eight hundred seventy-eight thousand, nine hundred ninety-four".