128047684 has 6 divisors (see below), whose sum is σ = 224083454. Its totient is φ = 64023840.

The previous prime is 128047651. The next prime is 128047687. The reversal of 128047684 is 486740821.

It can be written as a sum of positive squares in only one way, i.e., 115992900 + 12054784 = 10770^2 + 3472^2 .

It is not an unprimeable number, because it can be changed into a prime (128047687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16005957 + ... + 16005964.

Almost surely, 2^128047684 is an apocalyptic number.

It is an amenable number.

128047684 is a deficient number, since it is larger than the sum of its proper divisors (96035770).

128047684 is a wasteful number, since it uses less digits than its factorization.

128047684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32011925 (or 32011923 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 128047684 is about 11315.8156577420. The cubic root of 128047684 is about 504.0309935169.

The spelling of 128047684 in words is "one hundred twenty-eight million, forty-seven thousand, six hundred eighty-four".