644089152 has 112 divisors (see below), whose sum is σ = 1965301632. Its totient is φ = 182353920.

The previous prime is 644089111. The next prime is 644089169. The reversal of 644089152 is 251980446.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 644089152.

It is a congruent number.

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, 149752 + ... + 153992.

It is an arithmetic number, because the mean of its divisors is an integer number (17547336).

Almost surely, 2^644089152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644089152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (982650816).

644089152 is an abundant number, since it is smaller than the sum of its proper divisors (1321212480).

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

644089152 is a wasteful number, since it uses less digits than its factorization.

644089152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4376 (or 4366 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 644089152 is about 25378.9115605851. The cubic root of 644089152 is about 863.6053581791.

The spelling of 644089152 in words is "six hundred forty-four million, eighty-nine thousand, one hundred fifty-two".