644848 has 20 divisors (see below), whose sum is σ = 1281168. Its totient is φ = 314240.

The previous prime is 644843. The next prime is 644857. The reversal of 644848 is 848446.

644848 is a modest number, since divided by 4848 gives 64 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644843) 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 3 ways as a sum of consecutive naturals, for example, 165 + ... + 1147.

2⁶⁴⁴⁸⁴⁸ is an apocalyptic number.

It is an amenable number.

644848 is a deficient number, since it is larger than the sum of its proper divisors (636320).

644848 is a wasteful number, since it uses less digits than its factorization.

644848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032 (or 1026 counting only the distinct ones).

The product of its digits is 24576, while the sum is 34.

The square root of 644848 is about 803.0242835681. The cubic root of 644848 is about 86.3944383709.

The spelling of 644848 in words is "six hundred forty-four thousand, eight hundred forty-eight".