168640804 has 12 divisors (see below), whose sum is σ = 299164684. Its totient is φ = 83165184.

The previous prime is 168640793. The next prime is 168640847. The reversal of 168640804 is 408046861.

It can be written as a sum of positive squares in 2 ways, for example, as 103999204 + 64641600 = 10198^2 + 8040^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288477 + ... + 289060.

Almost surely, 2^168640804 is an apocalyptic number.

It is an amenable number.

168640804 is a deficient number, since it is larger than the sum of its proper divisors (130523880).

168640804 is a wasteful number, since it uses less digits than its factorization.

168640804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577614 (or 577612 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 168640804 is about 12986.1774206269. The cubic root of 168640804 is about 552.4855045575.

The spelling of 168640804 in words is "one hundred sixty-eight million, six hundred forty thousand, eight hundred four".