870686 has 4 divisors (see below), whose sum is σ = 1306032. Its totient is φ = 435342.

The previous prime is 870679. The next prime is 870691. The reversal of 870686 is 686078.

870686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×870686² = 1516188221192, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217670 + ... + 217673.

It is an arithmetic number, because the mean of its divisors is an integer number (326508).

2⁸⁷⁰⁶⁸⁶ is an apocalyptic number.

870686 is a deficient number, since it is larger than the sum of its proper divisors (435346).

870686 is a wasteful number, since it uses less digits than its factorization.

870686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435345.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 870686 is about 933.1055674467. The cubic root of 870686 is about 95.4891118129.

The spelling of 870686 in words is "eight hundred seventy thousand, six hundred eighty-six".