168728928 has 48 divisors (see below), whose sum is σ = 450189936. Its totient is φ = 55319040.

The previous prime is 168728921. The next prime is 168728953. The reversal of 168728928 is 829827861.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×168728928² = 56938902288058368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168728921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8551 + ... + 20262.

It is an arithmetic number, because the mean of its divisors is an integer number (9378957).

Almost surely, 2^168728928 is an apocalyptic number.

It is an amenable number.

168728928 is an abundant number, since it is smaller than the sum of its proper divisors (281461008).

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

168728928 is a wasteful number, since it uses less digits than its factorization.

168728928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28887 (or 28879 counting only the distinct ones).

The product of its digits is 774144, while the sum is 51.

The square root of 168728928 is about 12989.5699697873. The cubic root of 168728928 is about 552.5817223833.

The spelling of 168728928 in words is "one hundred sixty-eight million, seven hundred twenty-eight thousand, nine hundred twenty-eight".