648884 has 6 divisors (see below), whose sum is σ = 1135554. Its totient is φ = 324440.

The previous prime is 648871. The next prime is 648887. The reversal of 648884 is 488846.

It can be written as a sum of positive squares in only one way, i.e., 595984 + 52900 = 772^2 + 230^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648887) by changing a digit.

648884 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 81107 + ... + 81114.

It is an arithmetic number, because the mean of its divisors is an integer number (189259).

2⁶⁴⁸⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

648884 is a deficient number, since it is larger than the sum of its proper divisors (486670).

648884 is a wasteful number, since it uses less digits than its factorization.

648884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162225 (or 162223 counting only the distinct ones).

The product of its digits is 49152, while the sum is 38.

The square root of 648884 is about 805.5333636790. The cubic root of 648884 is about 86.5743066042.

Subtracting from 648884 its sum of digits (38), we obtain a palindrome (648846).

The spelling of 648884 in words is "six hundred forty-eight thousand, eight hundred eighty-four".