644477352 has 48 divisors (see below), whose sum is σ = 1664903520. Its totient is φ = 207888480.

The previous prime is 644477333. The next prime is 644477363. The reversal of 644477352 is 253774446.

644477352 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9093 + ... + 37035.

It is an arithmetic number, because the mean of its divisors is an integer number (34685490).

Almost surely, 2^644477352 is an apocalyptic number.

644477352 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 644477352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (832451760).

644477352 is an abundant number, since it is smaller than the sum of its proper divisors (1020426168).

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

644477352 is a wasteful number, since it uses less digits than its factorization.

644477352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28014 (or 27979 counting only the distinct ones).

The product of its digits is 564480, while the sum is 42.

The square root of 644477352 is about 25386.5584906659. The cubic root of 644477352 is about 863.7788249878.

The spelling of 644477352 in words is "six hundred forty-four million, four hundred seventy-seven thousand, three hundred fifty-two".