68720728 has 16 divisors (see below), whose sum is σ = 129050280. Its totient is φ = 34307328.

The previous prime is 68720723. The next prime is 68720741. The reversal of 68720728 is 82702786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68720723) 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, 825 + ... + 11752.

Almost surely, 2^68720728 is an apocalyptic number.

It is an amenable number.

68720728 is a deficient number, since it is larger than the sum of its proper divisors (60329552).

68720728 is a wasteful number, since it uses less digits than its factorization.

68720728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13266 (or 13262 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 68720728 is about 8289.7966199419. The cubic root of 68720728 is about 409.6024860231.

The spelling of 68720728 in words is "sixty-eight million, seven hundred twenty thousand, seven hundred twenty-eight".