168691728 has 40 divisors (see below), whose sum is σ = 458725600. Its totient is φ = 53270784.

The previous prime is 168691727. The next prime is 168691741. The reversal of 168691728 is 827196861.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (168691723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91573 + ... + 93396.

It is an arithmetic number, because the mean of its divisors is an integer number (11468140).

Almost surely, 2^168691728 is an apocalyptic number.

It is an amenable number.

168691728 is an abundant number, since it is smaller than the sum of its proper divisors (290033872).

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

168691728 is a wasteful number, since it uses less digits than its factorization.

168691728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184999 (or 184993 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 168691728 is about 12988.1379727812. The cubic root of 168691728 is about 552.5411098039.

The spelling of 168691728 in words is "one hundred sixty-eight million, six hundred ninety-one thousand, seven hundred twenty-eight".