663924 has 24 divisors (see below), whose sum is σ = 1576288. Its totient is φ = 217440.

The previous prime is 663907. The next prime is 663937. The reversal of 663924 is 429366.

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 an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 663891 and 663900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279 + ... + 1185.

2⁶⁶³⁹²⁴ is an apocalyptic number.

It is an amenable number.

663924 is an abundant number, since it is smaller than the sum of its proper divisors (912364).

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

663924 is a wasteful number, since it uses less digits than its factorization.

663924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 973 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 663924 is about 814.8153164982. The cubic root of 663924 is about 87.2380848144.

The spelling of 663924 in words is "six hundred sixty-three thousand, nine hundred twenty-four".