643006506 has 8 divisors (see below), whose sum is σ = 1286013024. Its totient is φ = 214335500.

The previous prime is 643006457. The next prime is 643006513. The reversal of 643006506 is 605600346.

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

643006506 is an admirable 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 in 3 ways as a sum of consecutive naturals, for example, 53583870 + ... + 53583881.

It is an arithmetic number, because the mean of its divisors is an integer number (160751628).

Almost surely, 2^643006506 is an apocalyptic number.

643006506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643006506 is a wasteful number, since it uses less digits than its factorization.

643006506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107167756.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 643006506 is about 25357.5729516845. The cubic root of 643006506 is about 863.1212102727.

The spelling of 643006506 in words is "six hundred forty-three million, six thousand, five hundred six".