866788 has 24 divisors (see below), whose sum is σ = 1662080. Its totient is φ = 393120.

The previous prime is 866783. The next prime is 866819. The reversal of 866788 is 887668.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (866783) 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, 4003 + ... + 4213.

2⁸⁶⁶⁷⁸⁸ is an apocalyptic number.

It is an amenable number.

866788 is a deficient number, since it is larger than the sum of its proper divisors (795292).

866788 is a wasteful number, since it uses less digits than its factorization.

866788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 305 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 866788 is about 931.0145004241. The cubic root of 866788 is about 95.3463992828.

The spelling of 866788 in words is "eight hundred sixty-six thousand, seven hundred eighty-eight".