128198604434 has 8 divisors (see below), whose sum is σ = 192407608380. Its totient is φ = 64062734976.

The previous prime is 128198604433. The next prime is 128198604481. The reversal of 128198604434 is 434406891821.

It can be written as a sum of positive squares in 2 ways, for example, as 127415444209 + 783160225 = 356953^2 + 27985^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128198604433) 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, 18279239 + ... + 18286250.

Almost surely, 2^128198604434 is an apocalyptic number.

128198604434 is a deficient number, since it is larger than the sum of its proper divisors (64209003946).

128198604434 is a wasteful number, since it uses less digits than its factorization.

128198604434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36567244.

The product of its (nonzero) digits is 1327104, while the sum is 50.

The spelling of 128198604434 in words is "one hundred twenty-eight billion, one hundred ninety-eight million, six hundred four thousand, four hundred thirty-four".