649648 has 20 divisors (see below), whose sum is σ = 1325560. Its totient is φ = 307584.

The previous prime is 649643. The next prime is 649651. The reversal of 649648 is 846946.

649648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (649643) by changing a digit.

649648 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, 765 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (66278).

2⁶⁴⁹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

649648 is an abundant number, since it is smaller than the sum of its proper divisors (675912).

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

649648 is a wasteful number, since it uses less digits than its factorization.

649648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164 (or 2158 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 649648 is about 806.0074441344. The cubic root of 649648 is about 86.6082709842.

The spelling of 649648 in words is "six hundred forty-nine thousand, six hundred forty-eight".