128637047 has 16 divisors (see below), whose sum is σ = 160704000. Its totient is φ = 100033440.

The previous prime is 128637031. The next prime is 128637059. The reversal of 128637047 is 740736821.

It is a cyclic number.

It is not a de Polignac number, because 128637047 - 2⁴ = 128637031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128637047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128637007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44729 + ... + 47517.

It is an arithmetic number, because the mean of its divisors is an integer number (10044000).

Almost surely, 2^128637047 is an apocalyptic number.

128637047 is a deficient number, since it is larger than the sum of its proper divisors (32066953).

128637047 is a wasteful number, since it uses less digits than its factorization.

128637047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 128637047 is about 11341.8273219089. The cubic root of 128637047 is about 504.8031085538.

The spelling of 128637047 in words is "one hundred twenty-eight million, six hundred thirty-seven thousand, forty-seven".