643444102 has 16 divisors (see below), whose sum is σ = 1105835040. Its totient is φ = 275064768.

The previous prime is 643444073. The next prime is 643444111. The reversal of 643444102 is 201444346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52327 + ... + 63442.

It is an arithmetic number, because the mean of its divisors is an integer number (69114690).

Almost surely, 2^643444102 is an apocalyptic number.

643444102 is a deficient number, since it is larger than the sum of its proper divisors (462390938).

643444102 is a wasteful number, since it uses less digits than its factorization.

643444102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116175.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 643444102 is about 25366.1999913270. The cubic root of 643444102 is about 863.3169639898.

Adding to 643444102 its reverse (201444346), we get a palindrome (844888448).

The spelling of 643444102 in words is "six hundred forty-three million, four hundred forty-four thousand, one hundred two".