878566 has 8 divisors (see below), whose sum is σ = 1419264. Its totient is φ = 405480.

The previous prime is 878551. The next prime is 878567. The reversal of 878566 is 665878.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878567) by changing a digit.

878566 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16870 + ... + 16921.

It is an arithmetic number, because the mean of its divisors is an integer number (177408).

2⁸⁷⁸⁵⁶⁶ is an apocalyptic number.

878566 is a deficient number, since it is larger than the sum of its proper divisors (540698).

878566 is a wasteful number, since it uses less digits than its factorization.

878566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33806.

The product of its digits is 80640, while the sum is 40.

The square root of 878566 is about 937.3185157672. The cubic root of 878566 is about 95.7763165988.

It can be divided in two parts, 878 and 566, that added together give a square (1444 = 38²).

The spelling of 878566 in words is "eight hundred seventy-eight thousand, five hundred sixty-six".