168908990 has 16 divisors (see below), whose sum is σ = 304188480. Its totient is φ = 67529760.

The previous prime is 168908983. The next prime is 168909001. The reversal of 168908990 is 99809861.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 29675 + ... + 34905.

It is an arithmetic number, because the mean of its divisors is an integer number (19011780).

Almost surely, 2^168908990 is an apocalyptic number.

168908990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168908990 is a deficient number, since it is larger than the sum of its proper divisors (135279490).

168908990 is a wasteful number, since it uses less digits than its factorization.

168908990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8467.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 168908990 is about 12996.4991440003. The cubic root of 168908990 is about 552.7782182227.

The spelling of 168908990 in words is "one hundred sixty-eight million, nine hundred eight thousand, nine hundred ninety".