663698 has 8 divisors (see below), whose sum is σ = 1137792. Its totient is φ = 284436.

The previous prime is 663683. The next prime is 663709. The reversal of 663698 is 896366.

It is a happy number.

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, 23690 + ... + 23717.

It is an arithmetic number, because the mean of its divisors is an integer number (142224).

2⁶⁶³⁶⁹⁸ is an apocalyptic number.

663698 is a deficient number, since it is larger than the sum of its proper divisors (474094).

663698 is a wasteful number, since it uses less digits than its factorization.

663698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47416.

The product of its digits is 46656, while the sum is 38.

The square root of 663698 is about 814.6766229615. The cubic root of 663698 is about 87.2281850645.

The spelling of 663698 in words is "six hundred sixty-three thousand, six hundred ninety-eight".