660650 has 24 divisors (see below), whose sum is σ = 1252524. Its totient is φ = 259200.

The previous prime is 660643. The next prime is 660659. The reversal of 660650 is 56066.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 72361 + 588289 = 269^2 + 767^2 .

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660650.

It is not an unprimeable number, because it can be changed into a prime (660659) by changing a digit.

660650 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 11 ways as a sum of consecutive naturals, for example, 3560 + ... + 3740.

2⁶⁶⁰⁶⁵⁰ is an apocalyptic number.

660650 is a deficient number, since it is larger than the sum of its proper divisors (591874).

660650 is a wasteful number, since it uses less digits than its factorization.

660650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 660650 is about 812.8037893612. The cubic root of 660650 is about 87.0944497661.

The spelling of 660650 in words is "six hundred sixty thousand, six hundred fifty".