663781672 has 16 divisors (see below), whose sum is σ = 1284739200. Its totient is φ = 321184560.

The previous prime is 663781661. The next prime is 663781673. The reversal of 663781672 is 276187366.

It is a super-2 number, since 2×663781672² = 881212216166231168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (663781673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338022 + ... + 1338517.

It is an arithmetic number, because the mean of its divisors is an integer number (80296200).

Almost surely, 2^663781672 is an apocalyptic number.

663781672 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

663781672 is a deficient number, since it is larger than the sum of its proper divisors (620957528).

663781672 is a wasteful number, since it uses less digits than its factorization.

663781672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676576 (or 2676572 counting only the distinct ones).

The product of its digits is 508032, while the sum is 46.

The square root of 663781672 is about 25763.9607203551. The cubic root of 663781672 is about 872.3185051177.

The spelling of 663781672 in words is "six hundred sixty-three million, seven hundred eighty-one thousand, six hundred seventy-two".