663798 has 16 divisors (see below), whose sum is σ = 1335600. Its totient is φ = 219936.

The previous prime is 663797. The next prime is 663821. The reversal of 663798 is 897366.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663798.

It is not an unprimeable number, because it can be changed into a prime (663797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1728 + ... + 2076.

It is an arithmetic number, because the mean of its divisors is an integer number (83475).

2⁶⁶³⁷⁹⁸ is an apocalyptic number.

663798 is an abundant number, since it is smaller than the sum of its proper divisors (671802).

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

663798 is a wasteful number, since it uses less digits than its factorization.

663798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671.

The product of its digits is 54432, while the sum is 39.

The square root of 663798 is about 814.7379946952. The cubic root of 663798 is about 87.2325657620.

The spelling of 663798 in words is "six hundred sixty-three thousand, seven hundred ninety-eight".