663447776 has 48 divisors (see below), whose sum is σ = 1378132560. Its totient is φ = 313528320.

The previous prime is 663447751. The next prime is 663447779. The reversal of 663447776 is 677744366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663447779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327920 + ... + 329936.

It is an arithmetic number, because the mean of its divisors is an integer number (28711095).

Almost surely, 2^663447776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663447776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689066280).

663447776 is an abundant number, since it is smaller than the sum of its proper divisors (714684784).

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

663447776 is a wasteful number, since it uses less digits than its factorization.

663447776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2587 (or 2579 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 50.

The square root of 663447776 is about 25757.4800009628. The cubic root of 663447776 is about 872.1722157966.

The spelling of 663447776 in words is "six hundred sixty-three million, four hundred forty-seven thousand, seven hundred seventy-six".