878689 has 4 divisors (see below), whose sum is σ = 1004224. Its totient is φ = 753156.

The previous prime is 878681. The next prime is 878699. The reversal of 878689 is 986878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 878689 - 2³ = 878681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62757 + ... + 62770.

It is an arithmetic number, because the mean of its divisors is an integer number (251056).

2⁸⁷⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

878689 is a deficient number, since it is larger than the sum of its proper divisors (125535).

878689 is a wasteful number, since it uses less digits than its factorization.

878689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125534.

The product of its digits is 193536, while the sum is 46.

The square root of 878689 is about 937.3841261724. The cubic root of 878689 is about 95.7807859793.

The spelling of 878689 in words is "eight hundred seventy-eight thousand, six hundred eighty-nine".