663912 has 24 divisors (see below), whose sum is σ = 1798290. Its totient is φ = 221280.

The previous prime is 663907. The next prime is 663937. The reversal of 663912 is 219366.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 427716 + 236196 = 654^2 + 486^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663912.

It is an unprimeable number.

663912 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 4539 + ... + 4682.

2⁶⁶³⁹¹² is an apocalyptic number.

It is an amenable number.

663912 is an abundant number, since it is smaller than the sum of its proper divisors (1134378).

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

663912 is a wasteful number, since it uses less digits than its factorization.

663912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9233 (or 9226 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 663912 is about 814.8079528331. The cubic root of 663912 is about 87.2375592205.

Adding to 663912 its product of digits (1944), we get a square (665856 = 816²).

The spelling of 663912 in words is "six hundred sixty-three thousand, nine hundred twelve".