168105988 has 24 divisors (see below), whose sum is σ = 309863232. Its totient is φ = 79642464.

The previous prime is 168105937. The next prime is 168105989. The reversal of 168105988 is 889501861.

It is a super-2 number, since 2×168105988² = 56519246402912288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (168105989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1306 + ... + 18382.

It is an arithmetic number, because the mean of its divisors is an integer number (12910968).

Almost surely, 2^168105988 is an apocalyptic number.

It is an amenable number.

168105988 is a deficient number, since it is larger than the sum of its proper divisors (141757244).

168105988 is a wasteful number, since it uses less digits than its factorization.

168105988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17211 (or 17209 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 168105988 is about 12965.5693280318. The cubic root of 168105988 is about 551.9008477304.

The spelling of 168105988 in words is "one hundred sixty-eight million, one hundred five thousand, nine hundred eighty-eight".