643320014 has 8 divisors (see below), whose sum is σ = 965772720. Its totient is φ = 321395776.

The previous prime is 643319981. The next prime is 643320037. The reversal of 643320014 is 410023346.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 129059 + ... + 133950.

It is an arithmetic number, because the mean of its divisors is an integer number (120721590).

Almost surely, 2^643320014 is an apocalyptic number.

643320014 is a deficient number, since it is larger than the sum of its proper divisors (322452706).

643320014 is a wasteful number, since it uses less digits than its factorization.

643320014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264234.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 643320014 is about 25363.7539414023. The cubic root of 643320014 is about 863.2614636170.

The spelling of 643320014 in words is "six hundred forty-three million, three hundred twenty thousand, fourteen".