65685728 has 24 divisors (see below), whose sum is σ = 131253192. Its totient is φ = 32351616.

The previous prime is 65685727. The next prime is 65685733. The reversal of 65685728 is 82758656.

It is a super-2 number, since 2×65685728² = 8629229725779968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65685727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13175 + ... + 17462.

It is an arithmetic number, because the mean of its divisors is an integer number (5468883).

Almost surely, 2^65685728 is an apocalyptic number.

It is an amenable number.

65685728 is a deficient number, since it is larger than the sum of its proper divisors (65567464).

65685728 is a wasteful number, since it uses less digits than its factorization.

65685728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30714 (or 30706 counting only the distinct ones).

The product of its digits is 806400, while the sum is 47.

The square root of 65685728 is about 8104.6732198158. The cubic root of 65685728 is about 403.4815425695.

The spelling of 65685728 in words is "sixty-five million, six hundred eighty-five thousand, seven hundred twenty-eight".