856633956 has 12 divisors (see below), whose sum is σ = 1998812592. Its totient is φ = 285544648.

The previous prime is 856633913. The next prime is 856633979. The reversal of 856633956 is 659336658.

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

It is a junction number, because it is equal to n+sod(n) for n = 856633899 and 856633908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35693070 + ... + 35693093.

It is an arithmetic number, because the mean of its divisors is an integer number (166567716).

Almost surely, 2^856633956 is an apocalyptic number.

It is an amenable number.

856633956 is an abundant number, since it is smaller than the sum of its proper divisors (1142178636).

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

856633956 is a wasteful number, since it uses less digits than its factorization.

856633956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71386170 (or 71386168 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 51.

The square root of 856633956 is about 29268.3097564584. The cubic root of 856633956 is about 949.7262206458.

The spelling of 856633956 in words is "eight hundred fifty-six million, six hundred thirty-three thousand, nine hundred fifty-six".