65681128 has 8 divisors (see below), whose sum is σ = 123152130. Its totient is φ = 32840560.

The previous prime is 65681117. The next prime is 65681129. The reversal of 65681128 is 82118656.

It can be written as a sum of positive squares in only one way, i.e., 65318724 + 362404 = 8082^2 + 602^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (65681129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4105063 + ... + 4105078.

Almost surely, 2^65681128 is an apocalyptic number.

It is an amenable number.

65681128 is a deficient number, since it is larger than the sum of its proper divisors (57471002).

65681128 is a wasteful number, since it uses less digits than its factorization.

65681128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8210147 (or 8210143 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 65681128 is about 8104.3894279582. The cubic root of 65681128 is about 403.4721236872.

The spelling of 65681128 in words is "sixty-five million, six hundred eighty-one thousand, one hundred twenty-eight".