128643729292 has 24 divisors (see below), whose sum is σ = 242462780000. Its totient is φ = 59369417856.

The previous prime is 128643729271. The next prime is 128643729307. The reversal of 128643729292 is 292927346821.

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, 632584 + ... + 810832.

Almost surely, 2^128643729292 is an apocalyptic number.

It is an amenable number.

128643729292 is a deficient number, since it is larger than the sum of its proper divisors (113819050708).

128643729292 is a wasteful number, since it uses less digits than its factorization.

128643729292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192145 (or 192143 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

The spelling of 128643729292 in words is "one hundred twenty-eight billion, six hundred forty-three million, seven hundred twenty-nine thousand, two hundred ninety-two".