663708 has 48 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 201600.

The previous prime is 663683. The next prime is 663709. The reversal of 663708 is 807366.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663709) by changing a digit.

663708 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 (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9313 + ... + 9383.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2⁶⁶³⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (846720).

663708 is an abundant number, since it is smaller than the sum of its proper divisors (1029732).

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

663708 is a wasteful number, since it uses less digits than its factorization.

663708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 663708 is about 814.6827603429. The cubic root of 663708 is about 87.2286231541.

The spelling of 663708 in words is "six hundred sixty-three thousand, seven hundred eight".