778812 has 12 divisors (see below), whose sum is σ = 1817256. Its totient is φ = 259600.

The previous prime is 778793. The next prime is 778819. The reversal of 778812 is 218877.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778819) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 32439 + ... + 32462.

It is an arithmetic number, because the mean of its divisors is an integer number (151438).

2⁷⁷⁸⁸¹² is an apocalyptic number.

It is an amenable number.

778812 is an abundant number, since it is smaller than the sum of its proper divisors (1038444).

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

778812 is a wasteful number, since it uses less digits than its factorization.

778812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64908 (or 64906 counting only the distinct ones).

The product of its digits is 6272, while the sum is 33.

The square root of 778812 is about 882.5032577844. The cubic root of 778812 is about 92.0048831687.

The spelling of 778812 in words is "seven hundred seventy-eight thousand, eight hundred twelve".