128290647 has 4 divisors (see below), whose sum is σ = 171054200. Its totient is φ = 85527096.

The previous prime is 128290637. The next prime is 128290649. The reversal of 128290647 is 746092821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 128290647 - 2⁶ = 128290583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128290649) 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 3 ways as a sum of consecutive naturals, for example, 21381772 + ... + 21381777.

It is an arithmetic number, because the mean of its divisors is an integer number (42763550).

Almost surely, 2^128290647 is an apocalyptic number.

128290647 is a deficient number, since it is larger than the sum of its proper divisors (42763553).

128290647 is an equidigital number, since it uses as much as digits as its factorization.

128290647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42763552.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 128290647 is about 11326.5461196253. The cubic root of 128290647 is about 504.3495818893.

The spelling of 128290647 in words is "one hundred twenty-eight million, two hundred ninety thousand, six hundred forty-seven".