660648 has 16 divisors (see below), whose sum is σ = 1651680. Its totient is φ = 220208.

The previous prime is 660643. The next prime is 660659. The reversal of 660648 is 846066.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (660643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13740 + ... + 13787.

It is an arithmetic number, because the mean of its divisors is an integer number (103230).

2⁶⁶⁰⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

660648 is an abundant number, since it is smaller than the sum of its proper divisors (991032).

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

660648 is a wasteful number, since it uses less digits than its factorization.

660648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27536 (or 27532 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 660648 is about 812.8025590511. The cubic root of 660648 is about 87.0943618784.

The spelling of 660648 in words is "six hundred sixty thousand, six hundred forty-eight".