168021928 has 16 divisors (see below), whose sum is σ = 317129760. Its totient is φ = 83454000.

The previous prime is 168021907. The next prime is 168021961. The reversal of 168021928 is 829120861.

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 in 3 ways as a sum of consecutive naturals, for example, 68338 + ... + 70753.

It is an arithmetic number, because the mean of its divisors is an integer number (19820610).

Almost surely, 2^168021928 is an apocalyptic number.

It is an amenable number.

168021928 is a deficient number, since it is larger than the sum of its proper divisors (149107832).

168021928 is a wasteful number, since it uses less digits than its factorization.

168021928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139248 (or 139244 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 168021928 is about 12962.3272601798. The cubic root of 168021928 is about 551.8088412514.

The spelling of 168021928 in words is "one hundred sixty-eight million, twenty-one thousand, nine hundred twenty-eight".