644614106 has 4 divisors (see below), whose sum is σ = 966921162. Its totient is φ = 322307052.

The previous prime is 644614051. The next prime is 644614129. The reversal of 644614106 is 601416446.

644614106 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 503598481 + 141015625 = 22441^2 + 11875^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161153525 + ... + 161153528.

Almost surely, 2^644614106 is an apocalyptic number.

644614106 is a deficient number, since it is larger than the sum of its proper divisors (322307056).

644614106 is a wasteful number, since it uses less digits than its factorization.

644614106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322307055.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 644614106 is about 25389.2517810195. The cubic root of 644614106 is about 863.8399167934.

The spelling of 644614106 in words is "six hundred forty-four million, six hundred fourteen thousand, one hundred six".