861080 has 64 divisors (see below), whose sum is σ = 2246400. Its totient is φ = 293760.

The previous prime is 861079. The next prime is 861083. The reversal of 861080 is 80168.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8309 + ... + 8411.

It is an arithmetic number, because the mean of its divisors is an integer number (35100).

2⁸⁶¹⁰⁸⁰ 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 861080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123200).

861080 is an abundant number, since it is smaller than the sum of its proper divisors (1385320).

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

861080 is a wasteful number, since it uses less digits than its factorization.

861080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 861080 is about 927.9439638254. The cubic root of 861080 is about 95.1366454638.

The spelling of 861080 in words is "eight hundred sixty-one thousand, eighty".