663774 has 8 divisors (see below), whose sum is σ = 1327560. Its totient is φ = 221256.

The previous prime is 663763. The next prime is 663787. The reversal of 663774 is 477366.

It is a sphenic number, since it is the product of 3 distinct primes.

663774 is an admirable number.

It is a congruent number.

It is an unprimeable number.

663774 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 3 ways as a sum of consecutive naturals, for example, 55309 + ... + 55320.

It is an arithmetic number, because the mean of its divisors is an integer number (165945).

2⁶⁶³⁷⁷⁴ is an apocalyptic number.

663774 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

663774 is a wasteful number, since it uses less digits than its factorization.

663774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110634.

The product of its digits is 21168, while the sum is 33.

The square root of 663774 is about 814.7232659008. The cubic root of 663774 is about 87.2315144347.

The spelling of 663774 in words is "six hundred sixty-three thousand, seven hundred seventy-four".