648944 has 10 divisors (see below), whose sum is σ = 1257360. Its totient is φ = 324464.

The previous prime is 648937. The next prime is 648953. The reversal of 648944 is 449846.

It is a super-2 number, since 2×648944² = 842256630272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

648944 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, 20264 + ... + 20295.

It is an arithmetic number, because the mean of its divisors is an integer number (125736).

2⁶⁴⁸⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

648944 is a deficient number, since it is larger than the sum of its proper divisors (608416).

648944 is a wasteful number, since it uses less digits than its factorization.

648944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40567 (or 40561 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 648944 is about 805.5706052234. The cubic root of 648944 is about 86.5769749282.

The spelling of 648944 in words is "six hundred forty-eight thousand, nine hundred forty-four".