168261220 has 48 divisors (see below), whose sum is σ = 362417328. Its totient is φ = 65594880.

The previous prime is 168261209. The next prime is 168261221. The reversal of 168261220 is 22162861.

It can be written as a sum of positive squares in 8 ways, for example, as 1954404 + 166306816 = 1398^2 + 12896^2 .

It is not an unprimeable number, because it can be changed into a prime (168261221) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 191422 + ... + 192298.

It is an arithmetic number, because the mean of its divisors is an integer number (7550361).

Almost surely, 2^168261220 is an apocalyptic number.

168261220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168261220 is an abundant number, since it is smaller than the sum of its proper divisors (194156108).

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

168261220 is a wasteful number, since it uses less digits than its factorization.

168261220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120 (or 1118 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 168261220 is about 12971.5542630789. The cubic root of 168261220 is about 552.0706737558.

The spelling of 168261220 in words is "one hundred sixty-eight million, two hundred sixty-one thousand, two hundred twenty".