644414344 has 32 divisors (see below), whose sum is σ = 1382328000. Its totient is φ = 275889600.

The previous prime is 644414341. The next prime is 644414347. The reversal of 644414344 is 443414446.

644414344 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (644414341) and next prime (644414347).

It is not an unprimeable number, because it can be changed into a prime (644414341) 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, 53382 + ... + 64330.

It is an arithmetic number, because the mean of its divisors is an integer number (43197750).

Almost surely, 2^644414344 is an apocalyptic number.

It is an amenable number.

644414344 is an abundant number, since it is smaller than the sum of its proper divisors (737913656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644414344 is a wasteful number, since it uses less digits than its factorization.

644414344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12013 (or 12009 counting only the distinct ones).

The product of its digits is 73728, while the sum is 34.

The square root of 644414344 is about 25385.3174886587. The cubic root of 644414344 is about 863.7506746581.

The spelling of 644414344 in words is "six hundred forty-four million, four hundred fourteen thousand, three hundred forty-four".