861012856 has 32 divisors (see below), whose sum is σ = 1763441280. Its totient is φ = 390863200.

The previous prime is 861012851. The next prime is 861012877. The reversal of 861012856 is 658210168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861012851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66861 + ... + 78691.

It is an arithmetic number, because the mean of its divisors is an integer number (55107540).

Almost surely, 2^861012856 is an apocalyptic number.

It is an amenable number.

861012856 is an abundant number, since it is smaller than the sum of its proper divisors (902428424).

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

861012856 is a wasteful number, since it uses less digits than its factorization.

861012856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12675 (or 12671 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 861012856 is about 29343.0205670786. The cubic root of 861012856 is about 951.3417259219.

The spelling of 861012856 in words is "eight hundred sixty-one million, twelve thousand, eight hundred fifty-six".