663894 has 48 divisors (see below), whose sum is σ = 1797120. Its totient is φ = 172080.

The previous prime is 663893. The next prime is 663907. The reversal of 663894 is 498366.

It is a Curzon number.

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 663894.

It is not an unprimeable number, because it can be changed into a prime (663893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1147 + ... + 1625.

It is an arithmetic number, because the mean of its divisors is an integer number (37440).

2⁶⁶³⁸⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898560).

663894 is an abundant number, since it is smaller than the sum of its proper divisors (1133226).

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

663894 is a wasteful number, since it uses less digits than its factorization.

663894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 502 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 663894 is about 814.7969072106. The cubic root of 663894 is about 87.2367708177.

The spelling of 663894 in words is "six hundred sixty-three thousand, eight hundred ninety-four".