643624402 has 8 divisors (see below), whose sum is σ = 965555712. Its totient is φ = 321772500.

The previous prime is 643624381. The next prime is 643624427. The reversal of 643624402 is 204426346.

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

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, 8527 + ... + 36877.

It is an arithmetic number, because the mean of its divisors is an integer number (120694464).

Almost surely, 2^643624402 is an apocalyptic number.

643624402 is a deficient number, since it is larger than the sum of its proper divisors (321931310).

643624402 is a wasteful number, since it uses less digits than its factorization.

643624402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39704.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 643624402 is about 25369.7536842595. The cubic root of 643624402 is about 863.3975933776.

The spelling of 643624402 in words is "six hundred forty-three million, six hundred twenty-four thousand, four hundred two".