866504 has 16 divisors (see below), whose sum is σ = 1644300. Its totient is φ = 428032.

The previous prime is 866477. The next prime is 866513. The reversal of 866504 is 405668.

It can be written as a sum of positive squares in 2 ways, for example, as 813604 + 52900 = 902^2 + 230^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104 + ... + 1320.

2⁸⁶⁶⁵⁰⁴ is an apocalyptic number.

It is an amenable number.

866504 is a deficient number, since it is larger than the sum of its proper divisors (777796).

866504 is a wasteful number, since it uses less digits than its factorization.

866504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312 (or 1308 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 866504 is about 930.8619661368. The cubic root of 866504 is about 95.3359848427.

The spelling of 866504 in words is "eight hundred sixty-six thousand, five hundred four".