63808640 has 64 divisors (see below), whose sum is σ = 174346560. Its totient is φ = 21875712.

The previous prime is 63808621. The next prime is 63808649. The reversal of 63808640 is 4680836.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 63808640.

It is not an unprimeable number, because it can be changed into a prime (63808649) 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 7 ways as a sum of consecutive naturals, for example, 2642 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (2724165).

Almost surely, 2^63808640 is an apocalyptic number.

It is an amenable number.

63808640 is an abundant number, since it is smaller than the sum of its proper divisors (110537920).

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

63808640 is a wasteful number, since it uses less digits than its factorization.

63808640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14269 (or 14257 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 63808640 is about 7988.0310465095. The cubic root of 63808640 is about 399.6009353342.

The spelling of 63808640 in words is "sixty-three million, eight hundred eight thousand, six hundred forty".