644453341 has 48 divisors (see below), whose sum is σ = 812592000. Its totient is φ = 508540032.

The previous prime is 644453339. The next prime is 644453347. The reversal of 644453341 is 143354446.

It is not a de Polignac number, because 644453341 - 2¹ = 644453339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 644453297 and 644453306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644453347) 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 47 ways as a sum of consecutive naturals, for example, 3238360 + ... + 3238558.

It is an arithmetic number, because the mean of its divisors is an integer number (16929000).

Almost surely, 2^644453341 is an apocalyptic number.

It is an amenable number.

644453341 is a deficient number, since it is larger than the sum of its proper divisors (168138659).

644453341 is a wasteful number, since it uses less digits than its factorization.

644453341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 331 counting only the distinct ones).

The product of its digits is 69120, while the sum is 34.

The square root of 644453341 is about 25386.0855785212. The cubic root of 644453341 is about 863.7680977162.

The spelling of 644453341 in words is "six hundred forty-four million, four hundred fifty-three thousand, three hundred forty-one".