663674 has 16 divisors (see below), whose sum is σ = 1100736. Its totient is φ = 297600.

The previous prime is 663661. The next prime is 663683. The reversal of 663674 is 476366.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 663674.

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, 1979 + ... + 2289.

It is an arithmetic number, because the mean of its divisors is an integer number (68796).

2⁶⁶³⁶⁷⁴ is an apocalyptic number.

663674 is a deficient number, since it is larger than the sum of its proper divisors (437062).

663674 is a wasteful number, since it uses less digits than its factorization.

663674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its digits is 18144, while the sum is 32.

The square root of 663674 is about 814.6618930575. The cubic root of 663674 is about 87.2271336317.

The spelling of 663674 in words is "six hundred sixty-three thousand, six hundred seventy-four".