663825440 has 24 divisors (see below), whose sum is σ = 1568287980. Its totient is φ = 265530112.

The previous prime is 663825431. The next prime is 663825479. The reversal of 663825440 is 44528366.

It can be written as a sum of positive squares in 2 ways, for example, as 651066256 + 12759184 = 25516^2 + 3572^2 .

It is a junction number, because it is equal to n+sod(n) for n = 663825394 and 663825403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074295 + ... + 2074614.

Almost surely, 2^663825440 is an apocalyptic number.

It is an amenable number.

663825440 is an abundant number, since it is smaller than the sum of its proper divisors (904462540).

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

663825440 is a wasteful number, since it uses less digits than its factorization.

663825440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148924 (or 4148916 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 663825440 is about 25764.8101099154. The cubic root of 663825440 is about 872.3376774846.

The spelling of 663825440 in words is "six hundred sixty-three million, eight hundred twenty-five thousand, four hundred forty".