663764 has 6 divisors (see below), whose sum is σ = 1161594. Its totient is φ = 331880.

The previous prime is 663763. The next prime is 663787. The reversal of 663764 is 467366.

It can be written as a sum of positive squares in only one way, i.e., 478864 + 184900 = 692^2 + 430^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 663764.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663763) by changing a digit.

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 as a sum of consecutive naturals, namely, 82967 + ... + 82974.

It is an arithmetic number, because the mean of its divisors is an integer number (193599).

2⁶⁶³⁷⁶⁴ is an apocalyptic number.

It is an amenable number.

663764 is a deficient number, since it is larger than the sum of its proper divisors (497830).

663764 is a wasteful number, since it uses less digits than its factorization.

663764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165945 (or 165943 counting only the distinct ones).

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

The square root of 663764 is about 814.7171288245. The cubic root of 663764 is about 87.2310763742.

The spelling of 663764 in words is "six hundred sixty-three thousand, seven hundred sixty-four".