861066 has 12 divisors (see below), whose sum is σ = 1865682. Its totient is φ = 287016.

The previous prime is 861059. The next prime is 861079. The reversal of 861066 is 660168.

It can be written as a sum of positive squares in only one way, i.e., 783225 + 77841 = 885^2 + 279^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23901 + ... + 23936.

2⁸⁶¹⁰⁶⁶ is an apocalyptic number.

861066 is an abundant number, since it is smaller than the sum of its proper divisors (1004616).

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

861066 is a wasteful number, since it uses less digits than its factorization.

861066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47845 (or 47842 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 861066 is about 927.9364202358. The cubic root of 861066 is about 95.1361298632.

It can be divided in two parts, 86106 and 6, that multiplied together give a triangular number (516636 = T₁₀₁₆).

The spelling of 861066 in words is "eight hundred sixty-one thousand, sixty-six".