877878 has 20 divisors (see below), whose sum is σ = 1967460. Its totient is φ = 292572.

The previous prime is 877873. The next prime is 877879. The reversal of 877878 is 878778.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877871) by changing a digit.

877878 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 (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2548 + ... + 2871.

It is an arithmetic number, because the mean of its divisors is an integer number (98373).

2⁸⁷⁷⁸⁷⁸ is an apocalyptic number.

877878 is an abundant number, since it is smaller than the sum of its proper divisors (1089582).

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

877878 is a wasteful number, since it uses less digits than its factorization.

877878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5433 (or 5424 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 877878 is about 936.9514395101. The cubic root of 877878 is about 95.7513094418.

Subtracting 877878 from its reverse (878778), we obtain a square (900 = 30²).

The spelling of 877878 in words is "eight hundred seventy-seven thousand, eight hundred seventy-eight".