856693656 has 144 divisors (see below), whose sum is σ = 2906794800. Its totient is φ = 225929088.

The previous prime is 856693639. The next prime is 856693657. The reversal of 856693656 is 656396658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856693657) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 36525 + ... + 55203.

It is an arithmetic number, because the mean of its divisors is an integer number (20186075).

Almost surely, 2^856693656 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 856693656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1453397400).

856693656 is an abundant number, since it is smaller than the sum of its proper divisors (2050101144).

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

856693656 is a wasteful number, since it uses less digits than its factorization.

856693656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18718 (or 18704 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The square root of 856693656 is about 29269.3296130950. The cubic root of 856693656 is about 949.7482827093.

The spelling of 856693656 in words is "eight hundred fifty-six million, six hundred ninety-three thousand, six hundred fifty-six".