643929319 has 8 divisors (see below), whose sum is σ = 703736208. Its totient is φ = 584333760.

The previous prime is 643929287. The next prime is 643929337. The reversal of 643929319 is 913929346.

643929319 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643929319 - 2⁵ = 643929287 is a prime.

It is a super-2 number, since 2×643929319² = 829289935735607522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643929379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46422 + ... + 58675.

It is an arithmetic number, because the mean of its divisors is an integer number (87967026).

Almost surely, 2^643929319 is an apocalyptic number.

643929319 is a deficient number, since it is larger than the sum of its proper divisors (59806889).

643929319 is a wasteful number, since it uses less digits than its factorization.

643929319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105665.

The product of its digits is 314928, while the sum is 46.

The square root of 643929319 is about 25375.7624318955. The cubic root of 643929319 is about 863.5339166951.

The spelling of 643929319 in words is "six hundred forty-three million, nine hundred twenty-nine thousand, three hundred nineteen".