866650 has 12 divisors (see below), whose sum is σ = 1612062. Its totient is φ = 346640.

The previous prime is 866641. The next prime is 866653. The reversal of 866650 is 56668.

It can be written as a sum of positive squares in 3 ways, for example, as 408321 + 458329 = 639^2 + 677^2 .

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (866653) 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 5 ways as a sum of consecutive naturals, for example, 8617 + ... + 8716.

2⁸⁶⁶⁶⁵⁰ is an apocalyptic number.

866650 is a deficient number, since it is larger than the sum of its proper divisors (745412).

866650 is a wasteful number, since it uses less digits than its factorization.

866650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17345 (or 17340 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 866650 is about 930.9403847723. The cubic root of 866650 is about 95.3413390292.

The spelling of 866650 in words is "eight hundred sixty-six thousand, six hundred fifty".