856217004 has 12 divisors (see below), whose sum is σ = 1997839704. Its totient is φ = 285405664.

The previous prime is 856216997. The next prime is 856217009. The reversal of 856217004 is 400712658.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (856217009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35675697 + ... + 35675720.

It is an arithmetic number, because the mean of its divisors is an integer number (166486642).

Almost surely, 2^856217004 is an apocalyptic number.

It is an amenable number.

856217004 is an abundant number, since it is smaller than the sum of its proper divisors (1141622700).

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

856217004 is a wasteful number, since it uses less digits than its factorization.

856217004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71351424 (or 71351422 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 856217004 is about 29261.1859636618. The cubic root of 856217004 is about 949.5721079473.

The spelling of 856217004 in words is "eight hundred fifty-six million, two hundred seventeen thousand, four".