856648 has 16 divisors (see below), whose sum is σ = 1729980. Its totient is φ = 395328.

The previous prime is 856637. The next prime is 856649. The reversal of 856648 is 846658.

It can be written as a sum of positive squares in 2 ways, for example, as 842724 + 13924 = 918^2 + 118^2 .

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (856649) by changing a digit.

856648 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4015 + ... + 4222.

2⁸⁵⁶⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

856648 is an abundant number, since it is smaller than the sum of its proper divisors (873332).

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

856648 is a wasteful number, since it uses less digits than its factorization.

856648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8256 (or 8252 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 856648 is about 925.5528077857. The cubic root of 856648 is about 94.9731410681.

The spelling of 856648 in words is "eight hundred fifty-six thousand, six hundred forty-eight".