68735728 has 20 divisors (see below), whose sum is σ = 133317360. Its totient is φ = 34331264.

The previous prime is 68735717. The next prime is 68735747. The reversal of 68735728 is 82753786.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19476 + ... + 22732.

It is an arithmetic number, because the mean of its divisors is an integer number (6665868).

Almost surely, 2^68735728 is an apocalyptic number.

It is an amenable number.

68735728 is a deficient number, since it is larger than the sum of its proper divisors (64581632).

68735728 is a wasteful number, since it uses less digits than its factorization.

68735728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584 (or 4578 counting only the distinct ones).

The product of its digits is 564480, while the sum is 46.

The square root of 68735728 is about 8290.7012972366. The cubic root of 68735728 is about 409.6322858157.

The spelling of 68735728 in words is "sixty-eight million, seven hundred thirty-five thousand, seven hundred twenty-eight".