663444400 has 30 divisors (see below), whose sum is σ = 1593926132. Its totient is φ = 265377600.

The previous prime is 663444389. The next prime is 663444437. The reversal of 663444400 is 4444366.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 828906 + ... + 829705.

Almost surely, 2^663444400 is an apocalyptic number.

It is an amenable number.

663444400 is an abundant number, since it is smaller than the sum of its proper divisors (930481732).

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

663444400 is a wasteful number, since it uses less digits than its factorization.

663444400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658629 (or 1658618 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 663444400 is about 25757.4144665182. The cubic root of 663444400 is about 872.1707364245.

Adding to 663444400 its reverse (4444366), we get a palindrome (667888766).

The spelling of 663444400 in words is "six hundred sixty-three million, four hundred forty-four thousand, four hundred".