820878 has 8 divisors (see below), whose sum is σ = 1641768. Its totient is φ = 273624.

The previous prime is 820873. The next prime is 820891. The reversal of 820878 is 878028.

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

820878 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820873) 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, 68401 + ... + 68412.

It is an arithmetic number, because the mean of its divisors is an integer number (205221).

2⁸²⁰⁸⁷⁸ is an apocalyptic number.

820878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

820878 is a wasteful number, since it uses less digits than its factorization.

820878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136818.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 820878 is about 906.0231785115. The cubic root of 820878 is about 93.6324107935.

The spelling of 820878 in words is "eight hundred twenty thousand, eight hundred seventy-eight".