643624606 has 8 divisors (see below), whose sum is σ = 967958784. Its totient is φ = 320971680.

The previous prime is 643624591. The next prime is 643624651. The reversal of 643624606 is 606426346.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419355 + ... + 420886.

It is an arithmetic number, because the mean of its divisors is an integer number (120994848).

Almost surely, 2^643624606 is an apocalyptic number.

643624606 is a deficient number, since it is larger than the sum of its proper divisors (324334178).

643624606 is a wasteful number, since it uses less digits than its factorization.

643624606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840626.

The product of its (nonzero) digits is 124416, while the sum is 37.

The square root of 643624606 is about 25369.7577047949. The cubic root of 643624606 is about 863.3976845970.

The spelling of 643624606 in words is "six hundred forty-three million, six hundred twenty-four thousand, six hundred six".