663747 has 8 divisors (see below), whose sum is σ = 1011456. Its totient is φ = 379272.

The previous prime is 663737. The next prime is 663763. The reversal of 663747 is 747366.

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

It is not a de Polignac number, because 663747 - 2⁶ = 663683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15783 + ... + 15824.

It is an arithmetic number, because the mean of its divisors is an integer number (126432).

2⁶⁶³⁷⁴⁷ is an apocalyptic number.

663747 is a deficient number, since it is larger than the sum of its proper divisors (347709).

663747 is a wasteful number, since it uses less digits than its factorization.

663747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31617.

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

The square root of 663747 is about 814.7066956887. The cubic root of 663747 is about 87.2303316613.

The spelling of 663747 in words is "six hundred sixty-three thousand, seven hundred forty-seven".