866690 has 16 divisors (see below), whose sum is σ = 1702080. Its totient is φ = 315120.

The previous prime is 866689. The next prime is 866693. The reversal of 866690 is 96668.

It is a super-2 number, since 2×866690² = 1502303112200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866690.

It is not an unprimeable number, because it can be changed into a prime (866693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3830 + ... + 4049.

It is an arithmetic number, because the mean of its divisors is an integer number (106380).

2⁸⁶⁶⁶⁹⁰ is an apocalyptic number.

866690 is a deficient number, since it is larger than the sum of its proper divisors (835390).

866690 is a wasteful number, since it uses less digits than its factorization.

866690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 866690 is about 930.9618681772. The cubic root of 866690 is about 95.3428058246.

It can be divided in two parts, 86 and 6690, that added together give a palindrome (6776).

The spelling of 866690 in words is "eight hundred sixty-six thousand, six hundred ninety".