644484153 has 16 divisors (see below), whose sum is σ = 866880000. Its totient is φ = 425884800.

The previous prime is 644484149. The next prime is 644484193. The reversal of 644484153 is 351484446.

It is not a de Polignac number, because 644484153 - 2² = 644484149 is a prime.

It is not an unprimeable number, because it can be changed into a prime (644484143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267448 + ... + 269846.

It is an arithmetic number, because the mean of its divisors is an integer number (54180000).

Almost surely, 2^644484153 is an apocalyptic number.

It is an amenable number.

644484153 is a deficient number, since it is larger than the sum of its proper divisors (222395847).

644484153 is a wasteful number, since it uses less digits than its factorization.

644484153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3152.

The product of its digits is 184320, while the sum is 39.

The square root of 644484153 is about 25386.6924391501. The cubic root of 644484153 is about 863.7818633874.

The spelling of 644484153 in words is "six hundred forty-four million, four hundred eighty-four thousand, one hundred fifty-three".