660630 has 48 divisors (see below), whose sum is σ = 1700784. Its totient is φ = 164160.

The previous prime is 660619. The next prime is 660643. The reversal of 660630 is 36066.

It is a junction number, because it is equal to n+sod(n) for n = 660597 and 660606.

It is a congruent number.

It is an unprimeable number.

660630 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 23 ways as a sum of consecutive naturals, for example, 10800 + ... + 10860.

It is an arithmetic number, because the mean of its divisors is an integer number (35433).

2⁶⁶⁰⁶³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850392).

660630 is an abundant number, since it is smaller than the sum of its proper divisors (1040154).

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

660630 is a wasteful number, since it uses less digits than its factorization.

660630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 660630 is about 812.7914861759. The cubic root of 660630 is about 87.0935708809.

Adding to 660630 its reverse (36066), we get a palindrome (696696).

The spelling of 660630 in words is "six hundred sixty thousand, six hundred thirty".