856992996 has 18 divisors (see below), whose sum is σ = 2166287942. Its totient is φ = 285664320.

The previous prime is 856992977. The next prime is 856993013. The reversal of 856992996 is 699299658.

It can be written as a sum of positive squares in only one way, i.e., 850305600 + 6687396 = 29160^2 + 2586^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11902645 + ... + 11902716.

Almost surely, 2^856992996 is an apocalyptic number.

It is an amenable number.

856992996 is an abundant number, since it is smaller than the sum of its proper divisors (1309294946).

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

856992996 is a wasteful number, since it uses less digits than its factorization.

856992996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23805371 (or 23805366 counting only the distinct ones).

The product of its digits is 18895680, while the sum is 63.

The square root of 856992996 is about 29274.4427103233. The cubic root of 856992996 is about 949.8588879970.

The spelling of 856992996 in words is "eight hundred fifty-six million, nine hundred ninety-two thousand, nine hundred ninety-six".