644424603 has 16 divisors (see below), whose sum is σ = 897227520. Its totient is φ = 410645664.

The previous prime is 644424581. The next prime is 644424629. The reversal of 644424603 is 306424446.

644424603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 644424603 - 2¹³ = 644416411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644424203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137700 + ... + 142302.

It is an arithmetic number, because the mean of its divisors is an integer number (56076720).

Almost surely, 2^644424603 is an apocalyptic number.

644424603 is a deficient number, since it is larger than the sum of its proper divisors (252802917).

644424603 is a wasteful number, since it uses less digits than its factorization.

644424603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6658.

The product of its (nonzero) digits is 55296, while the sum is 33.

The square root of 644424603 is about 25385.5195534777. The cubic root of 644424603 is about 863.7552582366.

The spelling of 644424603 in words is "six hundred forty-four million, four hundred twenty-four thousand, six hundred three".