856993536 has 162 divisors, whose sum is σ = 2874718392. Its totient is φ = 244823040.

The previous prime is 856993531. The next prime is 856993561. The reversal of 856993536 is 635399658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856993531) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 109101 + ... + 116691.

Almost surely, 2^856993536 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 856993536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1437359196).

856993536 is an abundant number, since it is smaller than the sum of its proper divisors (2017724856).

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

856993536 is a wasteful number, since it uses less digits than its factorization.

856993536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627 (or 7603 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 54.

The square root of 856993536 is about 29274.4519333838. The cubic root of 856993536 is about 949.8590875022.

The spelling of 856993536 in words is "eight hundred fifty-six million, nine hundred ninety-three thousand, five hundred thirty-six".