644147032 has 32 divisors (see below), whose sum is σ = 1235358720. Its totient is φ = 314739360.

The previous prime is 644147029. The next prime is 644147033. The reversal of 644147032 is 230741446.

644147032 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 644146985 and 644147003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644147033) 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, 484753 + ... + 486079.

It is an arithmetic number, because the mean of its divisors is an integer number (38604960).

Almost surely, 2^644147032 is an apocalyptic number.

It is an amenable number.

644147032 is a deficient number, since it is larger than the sum of its proper divisors (591211688).

644147032 is a wasteful number, since it uses less digits than its factorization.

644147032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671 (or 2667 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 644147032 is about 25380.0518517989. The cubic root of 644147032 is about 863.6312262238.

Adding to 644147032 its reverse (230741446), we get a palindrome (874888478).

The spelling of 644147032 in words is "six hundred forty-four million, one hundred forty-seven thousand, thirty-two".