644050 has 24 divisors (see below), whose sum is σ = 1307952. Its totient is φ = 234000.

The previous prime is 644047. The next prime is 644051. The reversal of 644050 is 50446.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (644051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36 + ... + 1135.

It is an arithmetic number, because the mean of its divisors is an integer number (54498).

2⁶⁴⁴⁰⁵⁰ is an apocalyptic number.

644050 is an abundant number, since it is smaller than the sum of its proper divisors (663902).

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

644050 is a wasteful number, since it uses less digits than its factorization.

644050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1194 (or 1189 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 644050 is about 802.5272581040. The cubic root of 644050 is about 86.3587859275.

Adding to 644050 its reverse (50446), we get a palindrome (694496).

It can be divided in two parts, 64 and 4050, that added together give a palindrome (4114).

The spelling of 644050 in words is "six hundred forty-four thousand, fifty".