660544 has 14 divisors (see below), whose sum is σ = 1310894. Its totient is φ = 330240.

The previous prime is 660529. The next prime is 660547. The reversal of 660544 is 445066.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 577600 + 82944 = 760^2 + 288^2 .

It is not an unprimeable number, because it can be changed into a prime (660547) by changing a digit.

660544 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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5097 + ... + 5224.

2⁶⁶⁰⁵⁴⁴ is an apocalyptic number.

660544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

660544 is a deficient number, since it is larger than the sum of its proper divisors (650350).

660544 is a wasteful number, since it uses less digits than its factorization.

660544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333 (or 10323 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 660544 is about 812.7385803566. The cubic root of 660544 is about 87.0897914723.

The spelling of 660544 in words is "six hundred sixty thousand, five hundred forty-four".