68144728 has 8 divisors (see below), whose sum is σ = 127771380. Its totient is φ = 34072360.

The previous prime is 68144711. The next prime is 68144767. The reversal of 68144728 is 82744186.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4259038 + ... + 4259053.

Almost surely, 2^68144728 is an apocalyptic number.

It is an amenable number.

68144728 is a deficient number, since it is larger than the sum of its proper divisors (59626652).

68144728 is a wasteful number, since it uses less digits than its factorization.

68144728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518097 (or 8518093 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 68144728 is about 8254.9820108829. The cubic root of 68144728 is about 408.4548784175.

The spelling of 68144728 in words is "sixty-eight million, one hundred forty-four thousand, seven hundred twenty-eight".