643359104 has 16 divisors (see below), whose sum is σ = 1281692220. Its totient is φ = 321679488.

The previous prime is 643359097. The next prime is 643359127. The reversal of 643359104 is 401953346.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2512994 + ... + 2513249.

Almost surely, 2^643359104 is an apocalyptic number.

643359104 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

643359104 is a deficient number, since it is larger than the sum of its proper divisors (638333116).

643359104 is an equidigital number, since it uses as much as digits as its factorization.

643359104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026257 (or 5026245 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 643359104 is about 25364.5245175225. The cubic root of 643359104 is about 863.2789480242.

The spelling of 643359104 in words is "six hundred forty-three million, three hundred fifty-nine thousand, one hundred four".