870665 has 16 divisors (see below), whose sum is σ = 1116288. Its totient is φ = 650496.

The previous prime is 870643. The next prime is 870679. The reversal of 870665 is 566078.

It is a cyclic number.

It is not a de Polignac number, because 870665 - 2⁶ = 870601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7649 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (69768).

2⁸⁷⁰⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

870665 is a deficient number, since it is larger than the sum of its proper divisors (245623).

870665 is a wasteful number, since it uses less digits than its factorization.

870665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 870665 is about 933.0943146328. The cubic root of 870665 is about 95.4883441089.

The spelling of 870665 in words is "eight hundred seventy thousand, six hundred sixty-five".