128673956 has 12 divisors (see below), whose sum is σ = 225281280. Its totient is φ = 64307880.

The previous prime is 128673953. The next prime is 128673991. The reversal of 128673956 is 659376821.

It is a self number, because there is not a number n which added to its sum of digits gives 128673956.

It is not an unprimeable number, because it can be changed into a prime (128673953) 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, 4961 + ... + 16791.

It is an arithmetic number, because the mean of its divisors is an integer number (18773440).

Almost surely, 2^128673956 is an apocalyptic number.

It is an amenable number.

128673956 is a deficient number, since it is larger than the sum of its proper divisors (96607324).

128673956 is a wasteful number, since it uses less digits than its factorization.

128673956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14554 (or 14552 counting only the distinct ones).

The product of its digits is 544320, while the sum is 47.

The square root of 128673956 is about 11343.4543239703. The cubic root of 128673956 is about 504.8513839060.

The spelling of 128673956 in words is "one hundred twenty-eight million, six hundred seventy-three thousand, nine hundred fifty-six".