856604008 has 64 divisors (see below), whose sum is σ = 1773576000. Its totient is φ = 385439232.

The previous prime is 856604003. The next prime is 856604009. The reversal of 856604008 is 800406658.

It is not an unprimeable number, because it can be changed into a prime (856604003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840123 + ... + 841141.

It is an arithmetic number, because the mean of its divisors is an integer number (27712125).

Almost surely, 2^856604008 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 856604008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886788000).

856604008 is an abundant number, since it is smaller than the sum of its proper divisors (916971992).

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

856604008 is a wasteful number, since it uses less digits than its factorization.

856604008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234 (or 1230 counting only the distinct ones).

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

The square root of 856604008 is about 29267.7981406186. The cubic root of 856604008 is about 949.7151530121.

The spelling of 856604008 in words is "eight hundred fifty-six million, six hundred four thousand, eight".