663746 has 8 divisors (see below), whose sum is σ = 1048080. Its totient is φ = 314388.

The previous prime is 663737. The next prime is 663763. The reversal of 663746 is 647366.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8696 + ... + 8771.

It is an arithmetic number, because the mean of its divisors is an integer number (131010).

2⁶⁶³⁷⁴⁶ is an apocalyptic number.

663746 is a deficient number, since it is larger than the sum of its proper divisors (384334).

663746 is a wasteful number, since it uses less digits than its factorization.

663746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17488.

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

The square root of 663746 is about 814.7060819707. The cubic root of 663746 is about 87.2302878542.

The spelling of 663746 in words is "six hundred sixty-three thousand, seven hundred forty-six".