644143362 has 16 divisors (see below), whose sum is σ = 1364068512. Its totient is φ = 202084160.

The previous prime is 644143351. The next prime is 644143363. The reversal of 644143362 is 263341446.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (644143363) 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, 3157464 + ... + 3157667.

It is an arithmetic number, because the mean of its divisors is an integer number (85254282).

Almost surely, 2^644143362 is an apocalyptic number.

644143362 is an abundant number, since it is smaller than the sum of its proper divisors (719925150).

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

644143362 is a wasteful number, since it uses less digits than its factorization.

644143362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6315153.

The product of its digits is 41472, while the sum is 33.

The square root of 644143362 is about 25379.9795508192. The cubic root of 644143362 is about 863.6295860534.

It can be divided in two parts, 64414 and 3362, that added together give a palindrome (67776).

The spelling of 644143362 in words is "six hundred forty-four million, one hundred forty-three thousand, three hundred sixty-two".