168404004 has 18 divisors (see below), whose sum is σ = 425687990. Its totient is φ = 56134656.

The previous prime is 168403967. The next prime is 168404021. The reversal of 168404004 is 400404861.

It can be written as a sum of positive squares in only one way, i.e., 94478400 + 73925604 = 9720^2 + 8598^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2338909 + ... + 2338980.

Almost surely, 2^168404004 is an apocalyptic number.

It is an amenable number.

168404004 is an abundant number, since it is smaller than the sum of its proper divisors (257283986).

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

168404004 is a wasteful number, since it uses less digits than its factorization.

168404004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677899 (or 4677894 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 168404004 is about 12977.0568311925. The cubic root of 168404004 is about 552.2267892935.

Adding to 168404004 its reverse (400404861), we get a palindrome (568808865).

The spelling of 168404004 in words is "one hundred sixty-eight million, four hundred four thousand, four".