168689994 has 32 divisors (see below), whose sum is σ = 371506176. Its totient is φ = 50638320.

The previous prime is 168689971. The next prime is 168690017. The reversal of 168689994 is 499986861.

It is an interprime number because it is at equal distance from previous prime (168689971) and next prime (168690017).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4882 + ... + 19005.

It is an arithmetic number, because the mean of its divisors is an integer number (11609568).

Almost surely, 2^168689994 is an apocalyptic number.

168689994 is an abundant number, since it is smaller than the sum of its proper divisors (202816182).

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

168689994 is a wasteful number, since it uses less digits than its factorization.

168689994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24010.

The product of its digits is 6718464, while the sum is 60.

The square root of 168689994 is about 12988.0712193920. The cubic root of 168689994 is about 552.5392165880.

It can be divided in two parts, 16868 and 9994, that added together give a palindrome (26862).

The spelling of 168689994 in words is "one hundred sixty-eight million, six hundred eighty-nine thousand, nine hundred ninety-four".