648404 has 12 divisors (see below), whose sum is σ = 1142484. Its totient is φ = 321984.

The previous prime is 648391. The next prime is 648433. The reversal of 648404 is 404846.

648404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 300304 + 348100 = 548^2 + 590^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (95207).

2⁶⁴⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

648404 is a deficient number, since it is larger than the sum of its proper divisors (494080).

648404 is a wasteful number, since it uses less digits than its factorization.

648404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 648404 is about 805.2353693176. The cubic root of 648404 is about 86.5529540882.

The spelling of 648404 in words is "six hundred forty-eight thousand, four hundred four".