663628 has 24 divisors (see below), whose sum is σ = 1344672. Its totient is φ = 280704.

The previous prime is 663601. The next prime is 663631. The reversal of 663628 is 826366.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 663628.

It is an unprimeable number.

663628 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 7 ways as a sum of consecutive naturals, for example, 3750 + ... + 3922.

It is an arithmetic number, because the mean of its divisors is an integer number (56028).

2⁶⁶³⁶²⁸ is an apocalyptic number.

It is an amenable number.

663628 is an abundant number, since it is smaller than the sum of its proper divisors (681044).

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

663628 is a wasteful number, since it uses less digits than its factorization.

663628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 319 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 663628 is about 814.6336599969. The cubic root of 663628 is about 87.2251183145.

The spelling of 663628 in words is "six hundred sixty-three thousand, six hundred twenty-eight".