648657 has 6 divisors (see below), whose sum is σ = 936962. Its totient is φ = 432432.

The previous prime is 648653. The next prime is 648671. The reversal of 648657 is 756846.

It is a happy number.

648657 is a `hidden beast` number, since 648 + 6 + 5 + 7 = 666.

648657 is digitally balanced in base 7, 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 only one way, i.e., 641601 + 7056 = 801^2 + 84^2 .

It is not a de Polignac number, because 648657 - 2² = 648653 is a prime.

It is a Duffinian number.

648657 is strictly pandigital in base 7.

It is not an unprimeable number, because it can be changed into a prime (648653) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 36028 + ... + 36045.

2⁶⁴⁸⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

648657 is a deficient number, since it is larger than the sum of its proper divisors (288305).

648657 is a wasteful number, since it uses less digits than its factorization.

648657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72079 (or 72076 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 648657 is about 805.3924509207. The cubic root of 648657 is about 86.5642099564.

The spelling of 648657 in words is "six hundred forty-eight thousand, six hundred fifty-seven".