643612106 has 8 divisors (see below), whose sum is σ = 965890980. Its totient is φ = 321648448.

The previous prime is 643612103. The next prime is 643612153. The reversal of 643612106 is 601216346.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 636805225 + 6806881 = 25235^2 + 2609^2 .

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

It is not an unprimeable number, because it can be changed into a prime (643612103) by changing a digit.

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, 73631 + ... + 81906.

Almost surely, 2^643612106 is an apocalyptic number.

643612106 is a deficient number, since it is larger than the sum of its proper divisors (322278874).

643612106 is a wasteful number, since it uses less digits than its factorization.

643612106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157608.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 643612106 is about 25369.5113472846. The cubic root of 643612106 is about 863.3920951375.

The spelling of 643612106 in words is "six hundred forty-three million, six hundred twelve thousand, one hundred six".