648656 has 20 divisors (see below), whose sum is σ = 1276704. Its totient is φ = 319200.

The previous prime is 648653. The next prime is 648671. The reversal of 648656 is 656846.

648656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851 + ... + 1421.

2⁶⁴⁸⁶⁵⁶ is an apocalyptic number.

648656 is the 431-st centered heptagonal number.

It is an amenable number.

648656 is a deficient number, since it is larger than the sum of its proper divisors (628048).

648656 is a wasteful number, since it uses less digits than its factorization.

648656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 644 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 648656 is about 805.3918301051. The cubic root of 648656 is about 86.5641654725.

The spelling of 648656 in words is "six hundred forty-eight thousand, six hundred fifty-six".