168168990 has 32 divisors (see below), whose sum is σ = 440297856. Its totient is φ = 40768160.

The previous prime is 168168989. The next prime is 168169013. The reversal of 168168990 is 99861861.

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 15 ways as a sum of consecutive naturals, for example, 254472 + ... + 255131.

It is an arithmetic number, because the mean of its divisors is an integer number (13759308).

Almost surely, 2^168168990 is an apocalyptic number.

168168990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168168990 is an abundant number, since it is smaller than the sum of its proper divisors (272128866).

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

168168990 is a wasteful number, since it uses less digits than its factorization.

168168990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509624.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 168168990 is about 12967.9986890807. The cubic root of 168168990 is about 551.9697854182.

The spelling of 168168990 in words is "one hundred sixty-eight million, one hundred sixty-eight thousand, nine hundred ninety".