648441 has 12 divisors (see below), whose sum is σ = 946660. Its totient is φ = 427680.

The previous prime is 648437. The next prime is 648449. The reversal of 648441 is 144846.

It can be written as a sum of positive squares in 2 ways, for example, as 484416 + 164025 = 696^2 + 405^2 .

It is not a de Polignac number, because 648441 - 2² = 648437 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 651 + ... + 1311.

2⁶⁴⁸⁴⁴¹ is an apocalyptic number.

It is an amenable number.

648441 is a deficient number, since it is larger than the sum of its proper divisors (298219).

648441 is a wasteful number, since it uses less digits than its factorization.

648441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 773 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 648441 is about 805.2583436389. The cubic root of 648441 is about 86.5546003860.

It can be divided in two parts, 648 and 441, that added together give a square (1089 = 33²).

The spelling of 648441 in words is "six hundred forty-eight thousand, four hundred forty-one".