663814 has 4 divisors (see below), whose sum is σ = 995724. Its totient is φ = 331906.

The previous prime is 663797. The next prime is 663821. The reversal of 663814 is 418366.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165952 + ... + 165955.

It is an arithmetic number, because the mean of its divisors is an integer number (248931).

2⁶⁶³⁸¹⁴ is an apocalyptic number.

663814 is a deficient number, since it is larger than the sum of its proper divisors (331910).

663814 is a wasteful number, since it uses less digits than its factorization.

663814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331909.

The product of its digits is 3456, while the sum is 28.

The square root of 663814 is about 814.7478137436. The cubic root of 663814 is about 87.2332666328.

The spelling of 663814 in words is "six hundred sixty-three thousand, eight hundred fourteen".