643359128 has 32 divisors (see below), whose sum is σ = 1280102400. Its totient is φ = 302473248.

The previous prime is 643359127. The next prime is 643359139. The reversal of 643359128 is 821953346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643359127) 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 in 7 ways as a sum of consecutive naturals, for example, 18776 + ... + 40487.

It is an arithmetic number, because the mean of its divisors is an integer number (40003200).

Almost surely, 2^643359128 is an apocalyptic number.

It is an amenable number.

643359128 is a deficient number, since it is larger than the sum of its proper divisors (636743272).

643359128 is a wasteful number, since it uses less digits than its factorization.

643359128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59351 (or 59347 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 643359128 is about 25364.5249906242. The cubic root of 643359128 is about 863.2789587588.

The spelling of 643359128 in words is "six hundred forty-three million, three hundred fifty-nine thousand, one hundred twenty-eight".