861056 has 48 divisors (see below), whose sum is σ = 2025720. Its totient is φ = 357120.

The previous prime is 861053. The next prime is 861059. The reversal of 861056 is 650168.

It is an interprime number because it is at equal distance from previous prime (861053) and next prime (861059).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27761 + ... + 27791.

2⁸⁶¹⁰⁵⁶ 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 861056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012860).

861056 is an abundant number, since it is smaller than the sum of its proper divisors (1164664).

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

861056 is an equidigital number, since it uses as much as digits as its factorization.

861056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 861056 is about 927.9310319199. The cubic root of 861056 is about 95.1357615736.

The spelling of 861056 in words is "eight hundred sixty-one thousand, fifty-six".