128656396 has 18 divisors (see below), whose sum is σ = 247478420. Its totient is φ = 58479960.

The previous prime is 128656393. The next prime is 128656397. The reversal of 128656396 is 693656821.

It is not an unprimeable number, because it can be changed into a prime (128656393) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 132426 + ... + 133393.

Almost surely, 2^128656396 is an apocalyptic number.

It is an amenable number.

128656396 is a deficient number, since it is larger than the sum of its proper divisors (118822024).

128656396 is a wasteful number, since it uses less digits than its factorization.

128656396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265845 (or 265832 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 128656396 is about 11342.6802828961. The cubic root of 128656396 is about 504.8284173480.

The spelling of 128656396 in words is "one hundred twenty-eight million, six hundred fifty-six thousand, three hundred ninety-six".