63881668 has 6 divisors (see below), whose sum is σ = 111792926. Its totient is φ = 31940832.

The previous prime is 63881641. The next prime is 63881677. The reversal of 63881668 is 86618836.

It is a happy number.

63881668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 63872064 + 9604 = 7992^2 + 98^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7985205 + ... + 7985212.

Almost surely, 2^63881668 is an apocalyptic number.

It is an amenable number.

63881668 is a deficient number, since it is larger than the sum of its proper divisors (47911258).

63881668 is a wasteful number, since it uses less digits than its factorization.

63881668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15970421 (or 15970419 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 63881668 is about 7992.6008282661. The cubic root of 63881668 is about 399.7533229073.

The spelling of 63881668 in words is "sixty-three million, eight hundred eighty-one thousand, six hundred sixty-eight".