666190 has 32 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 220320.

The previous prime is 666187. The next prime is 666191. The reversal of 666190 is 91666.

It is a happy number.

It is a super-2 number, since 2×666190² = 887618232200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2017 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (44352).

2⁶⁶⁶¹⁹⁰ is an apocalyptic number.

666190 is an abundant number, since it is smaller than the sum of its proper divisors (753074).

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

666190 is a wasteful number, since it uses less digits than its factorization.

666190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 666190 is about 816.2046312047. The cubic root of 666190 is about 87.3372211751.

The spelling of 666190 in words is "six hundred sixty-six thousand, one hundred ninety".