878665 has 8 divisors (see below), whose sum is σ = 1077120. Its totient is φ = 687792.

The previous prime is 878663. The next prime is 878677. The reversal of 878665 is 566878.

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

It is a cyclic number.

It is not a de Polignac number, because 878665 - 2¹ = 878663 is a prime.

878665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (878663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1635 + ... + 2104.

It is an arithmetic number, because the mean of its divisors is an integer number (134640).

2⁸⁷⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

878665 is a deficient number, since it is larger than the sum of its proper divisors (198455).

878665 is a wasteful number, since it uses less digits than its factorization.

878665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3791.

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

The square root of 878665 is about 937.3713245027. The cubic root of 878665 is about 95.7799139378.

The spelling of 878665 in words is "eight hundred seventy-eight thousand, six hundred sixty-five".