65681968 has 20 divisors (see below), whose sum is σ = 138828168. Its totient is φ = 29855360.

The previous prime is 65681947. The next prime is 65681977. The reversal of 65681968 is 86918656.

65681968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 in 3 ways as a sum of consecutive naturals, for example, 186421 + ... + 186772.

Almost surely, 2^65681968 is an apocalyptic number.

It is an amenable number.

65681968 is an abundant number, since it is smaller than the sum of its proper divisors (73146200).

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

65681968 is a wasteful number, since it uses less digits than its factorization.

65681968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373212 (or 373206 counting only the distinct ones).

The product of its digits is 622080, while the sum is 49.

The square root of 65681968 is about 8104.4412515608. The cubic root of 65681968 is about 403.4738436898.

The spelling of 65681968 in words is "sixty-five million, six hundred eighty-one thousand, nine hundred sixty-eight".