648444 has 12 divisors (see below), whose sum is σ = 1513064. Its totient is φ = 216144.

The previous prime is 648437. The next prime is 648449. The reversal of 648444 is 444846.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×648444² = 840959242272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648449) by changing a digit.

648444 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27007 + ... + 27030.

2⁶⁴⁸⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

648444 is an abundant number, since it is smaller than the sum of its proper divisors (864620).

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

648444 is a wasteful number, since it uses less digits than its factorization.

648444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54044 (or 54042 counting only the distinct ones).

The product of its digits is 12288, while the sum is 30.

The square root of 648444 is about 805.2602063929. The cubic root of 648444 is about 86.5547338669.

The spelling of 648444 in words is "six hundred forty-eight thousand, four hundred forty-four".