644424303 has 8 divisors (see below), whose sum is σ = 859817728. Its totient is φ = 429323544.

The previous prime is 644424269. The next prime is 644424317. The reversal of 644424303 is 303424446.

644424303 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 644424303 - 2⁸ = 644424047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644424323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67975 + ... + 76872.

It is an arithmetic number, because the mean of its divisors is an integer number (107477216).

Almost surely, 2^644424303 is an apocalyptic number.

644424303 is a deficient number, since it is larger than the sum of its proper divisors (215393425).

644424303 is a wasteful number, since it uses less digits than its factorization.

644424303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146333.

The product of its (nonzero) digits is 27648, while the sum is 30.

The square root of 644424303 is about 25385.5136445966. The cubic root of 644424303 is about 863.7551242014.

Adding to 644424303 its reverse (303424446), we get a palindrome (947848749).

The spelling of 644424303 in words is "six hundred forty-four million, four hundred twenty-four thousand, three hundred three".