630666 has 40 divisors (see below), whose sum is σ = 1502820. Its totient is φ = 196992.

The previous prime is 630659. The next prime is 630677. The reversal of 630666 is 666036.

It can be written as a sum of positive squares in 2 ways, for example, as 531441 + 99225 = 729^2 + 315^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

630666 is a modest number, since divided by 666 gives 630 as remainder.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2640 + ... + 2868.

2⁶³⁰⁶⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 630666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751410).

630666 is an abundant number, since it is smaller than the sum of its proper divisors (872154).

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

630666 is a wasteful number, since it uses less digits than its factorization.

630666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 630666 is about 794.1448230644. The cubic root of 630666 is about 85.7563864606.

It can be divided in two parts, 630 and 666, that added together give a 4-th power (1296 = 6⁴).

The spelling of 630666 in words is "six hundred thirty thousand, six hundred sixty-six".