866664 has 24 divisors (see below), whose sum is σ = 2347410. Its totient is φ = 288864.

The previous prime is 866653. The next prime is 866683. The reversal of 866664 is 466668.

866664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 864900 + 1764 = 930^2 + 42^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×866664² = 1502212977792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5947 + ... + 6090.

2⁸⁶⁶⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

866664 is an abundant number, since it is smaller than the sum of its proper divisors (1480746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866664 is a wasteful number, since it uses less digits than its factorization.

866664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12049 (or 12042 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 866664 is about 930.9479040204. The cubic root of 866664 is about 95.3418524127.

The spelling of 866664 in words is "eight hundred sixty-six thousand, six hundred sixty-four".