663481672 has 64 divisors (see below), whose sum is σ = 1502899200. Its totient is φ = 268246080.

The previous prime is 663481631. The next prime is 663481673. The reversal of 663481672 is 276184366.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (663481673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 278647 + ... + 281017.

It is an arithmetic number, because the mean of its divisors is an integer number (23482800).

Almost surely, 2^663481672 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 663481672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751449600).

663481672 is an abundant number, since it is smaller than the sum of its proper divisors (839417528).

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

663481672 is a wasteful number, since it uses less digits than its factorization.

663481672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2666 (or 2662 counting only the distinct ones).

The product of its digits is 290304, while the sum is 43.

The square root of 663481672 is about 25758.1379761814. The cubic root of 663481672 is about 872.1870688350.

The spelling of 663481672 in words is "six hundred sixty-three million, four hundred eighty-one thousand, six hundred seventy-two".