168906728 has 16 divisors (see below), whose sum is σ = 321161760. Its totient is φ = 83263600.

The previous prime is 168906721. The next prime is 168906763. The reversal of 168906728 is 827609861.

168906728 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (168906721) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 148118 + ... + 149253.

It is an arithmetic number, because the mean of its divisors is an integer number (20072610).

Almost surely, 2^168906728 is an apocalyptic number.

It is an amenable number.

168906728 is a deficient number, since it is larger than the sum of its proper divisors (152255032).

168906728 is a wasteful number, since it uses less digits than its factorization.

168906728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297448 (or 297444 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 168906728 is about 12996.4121202738. The cubic root of 168906728 is about 552.7757506416.

The spelling of 168906728 in words is "one hundred sixty-eight million, nine hundred six thousand, seven hundred twenty-eight".