861678 has 32 divisors (see below), whose sum is σ = 1948320. Its totient is φ = 285768.

The previous prime is 861659. The next prime is 861691. The reversal of 861678 is 876168.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4276 + ... + 4472.

It is an arithmetic number, because the mean of its divisors is an integer number (60885).

2⁸⁶¹⁶⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (974160).

861678 is an abundant number, since it is smaller than the sum of its proper divisors (1086642).

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

861678 is an equidigital number, since it uses as much as digits as its factorization.

861678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 202 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 861678 is about 928.2661256342. The cubic root of 861678 is about 95.1586637622.

It can be divided in two parts, 86 and 1678, that added together give a square (1764 = 42²).

The spelling of 861678 in words is "eight hundred sixty-one thousand, six hundred seventy-eight".