65717728 has 24 divisors (see below), whose sum is σ = 129678192. Its totient is φ = 32783616.

The previous prime is 65717719. The next prime is 65717753. The reversal of 65717728 is 82771756.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13476 + ... + 17692.

It is an arithmetic number, because the mean of its divisors is an integer number (5403258).

Almost surely, 2^65717728 is an apocalyptic number.

It is an amenable number.

65717728 is a deficient number, since it is larger than the sum of its proper divisors (63960464).

65717728 is a wasteful number, since it uses less digits than its factorization.

65717728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4714 (or 4706 counting only the distinct ones).

The product of its digits is 164640, while the sum is 43.

The square root of 65717728 is about 8106.6471490993. The cubic root of 65717728 is about 403.5470530624.

The spelling of 65717728 in words is "sixty-five million, seven hundred seventeen thousand, seven hundred twenty-eight".