866090 has 16 divisors (see below), whose sum is σ = 1569672. Its totient is φ = 344064.

The previous prime is 866087. The next prime is 866093. The reversal of 866090 is 90668.

It is an interprime number because it is at equal distance from previous prime (866087) and next prime (866093).

It can be written as a sum of positive squares in 4 ways, for example, as 811801 + 54289 = 901^2 + 233^2 .

It is a super-2 number, since 2×866090² = 1500223776200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866093) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2402 + ... + 2738.

2⁸⁶⁶⁰⁹⁰ is an apocalyptic number.

866090 is a deficient number, since it is larger than the sum of its proper divisors (703582).

866090 is a wasteful number, since it uses less digits than its factorization.

866090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 866090 is about 930.6395650304. The cubic root of 866090 is about 95.3207991519.

The spelling of 866090 in words is "eight hundred sixty-six thousand, ninety".