128730646 has 16 divisors (see below), whose sum is σ = 210897360. Its totient is φ = 58445280.

The previous prime is 128730619. The next prime is 128730653. The reversal of 128730646 is 646037821.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 19000 + ... + 24868.

It is an arithmetic number, because the mean of its divisors is an integer number (13181085).

Almost surely, 2^128730646 is an apocalyptic number.

128730646 is a deficient number, since it is larger than the sum of its proper divisors (82166714).

128730646 is a wasteful number, since it uses less digits than its factorization.

128730646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 128730646 is about 11345.9528467203. The cubic root of 128730646 is about 504.9255139626.

The spelling of 128730646 in words is "one hundred twenty-eight million, seven hundred thirty thousand, six hundred forty-six".