168840028 has 24 divisors (see below), whose sum is σ = 346808672. Its totient is φ = 70403904.

The previous prime is 168840013. The next prime is 168840037. The reversal of 168840028 is 820048861.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

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, 80451 + ... + 82522.

Almost surely, 2^168840028 is an apocalyptic number.

It is an amenable number.

168840028 is an abundant number, since it is smaller than the sum of its proper divisors (177968644).

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

168840028 is a wasteful number, since it uses less digits than its factorization.

168840028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163021 (or 163019 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 168840028 is about 12993.8457740578. The cubic root of 168840028 is about 552.7029787291.

Adding to 168840028 its reverse (820048861), we get a palindrome (988888889).

The spelling of 168840028 in words is "one hundred sixty-eight million, eight hundred forty thousand, twenty-eight".