870656 has 36 divisors (see below), whose sum is σ = 1839600. Its totient is φ = 410112.

The previous prime is 870643. The next prime is 870679. The reversal of 870656 is 656078.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

870656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4775 + ... + 4953.

It is an arithmetic number, because the mean of its divisors is an integer number (51100).

2⁸⁷⁰⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 870656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919800).

870656 is an abundant number, since it is smaller than the sum of its proper divisors (968944).

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

870656 is a wasteful number, since it uses less digits than its factorization.

870656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 200 counting only the distinct ones).

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

The square root of 870656 is about 933.0894919567. The cubic root of 870656 is about 95.4880150891.

The spelling of 870656 in words is "eight hundred seventy thousand, six hundred fifty-six".