168391928 has 8 divisors (see below), whose sum is σ = 315734880. Its totient is φ = 84195960.

The previous prime is 168391891. The next prime is 168391963. The reversal of 168391928 is 829193861.

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, 10524488 + ... + 10524503.

It is an arithmetic number, because the mean of its divisors is an integer number (39466860).

Almost surely, 2^168391928 is an apocalyptic number.

It is an amenable number.

168391928 is a deficient number, since it is larger than the sum of its proper divisors (147342952).

168391928 is a wasteful number, since it uses less digits than its factorization.

168391928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21048997 (or 21048993 counting only the distinct ones).

The product of its digits is 186624, while the sum is 47.

The square root of 168391928 is about 12976.5915401541. The cubic root of 168391928 is about 552.2135891914.

The spelling of 168391928 in words is "one hundred sixty-eight million, three hundred ninety-one thousand, nine hundred twenty-eight".