63640768 has 28 divisors (see below), whose sum is σ = 130364992. Its totient is φ = 30792960.

The previous prime is 63640729. The next prime is 63640769. The reversal of 63640768 is 86704636.

It is a self number, because there is not a number n which added to its sum of digits gives 63640768.

It is not an unprimeable number, because it can be changed into a prime (63640769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14055 + ... + 18022.

Almost surely, 2^63640768 is an apocalyptic number.

It is an amenable number.

63640768 is an abundant number, since it is smaller than the sum of its proper divisors (66724224).

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

63640768 is a wasteful number, since it uses less digits than its factorization.

63640768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32120 (or 32110 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 63640768 is about 7977.5164054986. The cubic root of 63640768 is about 399.2501953607.

The spelling of 63640768 in words is "sixty-three million, six hundred forty thousand, seven hundred sixty-eight".