861278 has 12 divisors (see below), whose sum is σ = 1420440. Its totient is φ = 391380.

The previous prime is 861239. The next prime is 861293. The reversal of 861278 is 872168.

861278 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

861278 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1538 + ... + 2021.

It is an arithmetic number, because the mean of its divisors is an integer number (118370).

2⁸⁶¹²⁷⁸ is an apocalyptic number.

861278 is a deficient number, since it is larger than the sum of its proper divisors (559162).

861278 is a wasteful number, since it uses less digits than its factorization.

861278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3583 (or 3572 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 861278 is about 928.0506451698. The cubic root of 861278 is about 95.1439369320.

The spelling of 861278 in words is "eight hundred sixty-one thousand, two hundred seventy-eight".