644507112 has 64 divisors (see below), whose sum is σ = 1667727360. Its totient is φ = 207345600.

The previous prime is 644507089. The next prime is 644507141. The reversal of 644507112 is 211705446.

644507112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 644507112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343537 + ... + 345407.

It is an arithmetic number, because the mean of its divisors is an integer number (26058240).

Almost surely, 2^644507112 is an apocalyptic number.

644507112 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644507112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833863680).

644507112 is an abundant number, since it is smaller than the sum of its proper divisors (1023220248).

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

644507112 is a wasteful number, since it uses less digits than its factorization.

644507112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374 (or 2370 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 644507112 is about 25387.1446208509. The cubic root of 644507112 is about 863.7921203411.

The spelling of 644507112 in words is "six hundred forty-four million, five hundred seven thousand, one hundred twelve".