643144 has 16 divisors (see below), whose sum is σ = 1277100. Its totient is φ = 302592.

The previous prime is 643129. The next prime is 643183. The reversal of 643144 is 441346.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 624100 + 19044 = 790^2 + 138^2 .

It is a nialpdrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229 + ... + 2500.

2⁶⁴³¹⁴⁴ is an apocalyptic number.

It is an amenable number.

643144 is a deficient number, since it is larger than the sum of its proper divisors (633956).

643144 is a wasteful number, since it uses less digits than its factorization.

643144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4752 (or 4748 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 643144 is about 801.9625926438. The cubic root of 643144 is about 86.3182726255.

It can be divided in two parts, 643 and 144, that added together give a palindrome (787).

The spelling of 643144 in words is "six hundred forty-three thousand, one hundred forty-four".