778878 has 12 divisors (see below), whose sum is σ = 1687608. Its totient is φ = 259620.

The previous prime is 778873. The next prime is 778879. The reversal of 778878 is 878877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778871) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 21618 + ... + 21653.

It is an arithmetic number, because the mean of its divisors is an integer number (140634).

2⁷⁷⁸⁸⁷⁸ is an apocalyptic number.

778878 is an abundant number, since it is smaller than the sum of its proper divisors (908730).

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

778878 is a wasteful number, since it uses less digits than its factorization.

778878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43279 (or 43276 counting only the distinct ones).

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

The square root of 778878 is about 882.5406506218. The cubic root of 778878 is about 92.0074820632.

Subtracting 778878 from its reverse (878877), we obtain a palindrome (99999).

The spelling of 778878 in words is "seven hundred seventy-eight thousand, eight hundred seventy-eight".