644296852 has 12 divisors (see below), whose sum is σ = 1127698740. Its totient is φ = 322097216.

The previous prime is 644296847. The next prime is 644296853. The reversal of 644296852 is 258692446.

It can be written as a sum of positive squares in 2 ways, for example, as 81468676 + 562828176 = 9026^2 + 23724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644296853) 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 3 ways as a sum of consecutive naturals, for example, 37224 + ... + 51712.

It is an arithmetic number, because the mean of its divisors is an integer number (93974895).

Almost surely, 2^644296852 is an apocalyptic number.

It is an amenable number.

644296852 is a deficient number, since it is larger than the sum of its proper divisors (483401888).

644296852 is a wasteful number, since it uses less digits than its factorization.

644296852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25610 (or 25608 counting only the distinct ones).

The product of its digits is 829440, while the sum is 46.

The square root of 644296852 is about 25383.0032108102. The cubic root of 644296852 is about 863.6981773979.

The spelling of 644296852 in words is "six hundred forty-four million, two hundred ninety-six thousand, eight hundred fifty-two".