663639768 has 48 divisors (see below), whose sum is σ = 1960756200. Its totient is φ = 201102720.

The previous prime is 663639763. The next prime is 663639773. The reversal of 663639768 is 867936366.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (663639763) and next prime (663639773).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663639763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418173 + ... + 419756.

Almost surely, 2^663639768 is an apocalyptic number.

It is an amenable number.

663639768 is an abundant number, since it is smaller than the sum of its proper divisors (1297116432).

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

663639768 is a wasteful number, since it uses less digits than its factorization.

663639768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837952 (or 837945 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The square root of 663639768 is about 25761.2066487577. The cubic root of 663639768 is about 872.2563389405.

The spelling of 663639768 in words is "six hundred sixty-three million, six hundred thirty-nine thousand, seven hundred sixty-eight".