168315728 has 20 divisors (see below), whose sum is σ = 372699360. Its totient is φ = 72135264.

The previous prime is 168315713. The next prime is 168315761. The reversal of 168315728 is 827513861.

It is a Smith number, since the sum of its digits (41) 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, 751298 + ... + 751521.

It is an arithmetic number, because the mean of its divisors is an integer number (18634968).

Almost surely, 2^168315728 is an apocalyptic number.

It is an amenable number.

168315728 is an abundant number, since it is smaller than the sum of its proper divisors (204383632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

168315728 is a wasteful number, since it uses less digits than its factorization.

168315728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502834 (or 1502828 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 168315728 is about 12973.6551518838. The cubic root of 168315728 is about 552.1302815082.

The spelling of 168315728 in words is "one hundred sixty-eight million, three hundred fifteen thousand, seven hundred twenty-eight".