644036312 has 32 divisors (see below), whose sum is σ = 1275279600. Its totient is φ = 304072704.

The previous prime is 644036311. The next prime is 644036329. The reversal of 644036312 is 213630446.

644036312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×644036312² = 829565542349122688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644036311) 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, 40808 + ... + 54344.

Almost surely, 2^644036312 is an apocalyptic number.

It is an amenable number.

644036312 is a deficient number, since it is larger than the sum of its proper divisors (631243288).

644036312 is a wasteful number, since it uses less digits than its factorization.

644036312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13875 (or 13871 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 644036312 is about 25377.8705174410. The cubic root of 644036312 is about 863.5817412854.

Adding to 644036312 its reverse (213630446), we get a palindrome (857666758).

The spelling of 644036312 in words is "six hundred forty-four million, thirty-six thousand, three hundred twelve".