861176856 has 64 divisors (see below), whose sum is σ = 2251929600. Its totient is φ = 273920768.

The previous prime is 861176851. The next prime is 861176891. The reversal of 861176856 is 658671168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861176851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262780 + ... + 266036.

It is an arithmetic number, because the mean of its divisors is an integer number (35186400).

Almost surely, 2^861176856 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 861176856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1125964800).

861176856 is an abundant number, since it is smaller than the sum of its proper divisors (1390752744).

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

861176856 is a wasteful number, since it uses less digits than its factorization.

861176856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3768 (or 3764 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 861176856 is about 29345.8149656812. The cubic root of 861176856 is about 951.4021238347.

The spelling of 861176856 in words is "eight hundred sixty-one million, one hundred seventy-six thousand, eight hundred fifty-six".