643624626 has 8 divisors (see below), whose sum is σ = 1287249264. Its totient is φ = 214541540.

The previous prime is 643624591. The next prime is 643624651. The reversal of 643624626 is 626426346.

It is a happy number.

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

643624626 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53635380 + ... + 53635391.

It is an arithmetic number, because the mean of its divisors is an integer number (160906158).

Almost surely, 2^643624626 is an apocalyptic number.

643624626 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.

643624626 is a wasteful number, since it uses less digits than its factorization.

643624626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107270776.

The product of its digits is 248832, while the sum is 39.

The square root of 643624626 is about 25369.7580989650. The cubic root of 643624626 is about 863.3976935401.

The spelling of 643624626 in words is "six hundred forty-three million, six hundred twenty-four thousand, six hundred twenty-six".