166290 has 32 divisors (see below), whose sum is σ = 418176. Its totient is φ = 42240.

The previous prime is 166289. The next prime is 166297. The reversal of 166290 is 92661.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 166290.

It is not an unprimeable number, because it can be changed into a prime (166297) 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 15 ways as a sum of consecutive naturals, for example, 570 + ... + 810.

It is an arithmetic number, because the mean of its divisors is an integer number (13068).

2¹⁶⁶²⁹⁰ is an apocalyptic number.

166290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209088).

166290 is an abundant number, since it is smaller than the sum of its proper divisors (251886).

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

166290 is a wasteful number, since it uses less digits than its factorization.

166290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 166290 is about 407.7867089546. The cubic root of 166290 is about 54.9906320133.

The spelling of 166290 in words is "one hundred sixty-six thousand, two hundred ninety".