778864 has 10 divisors (see below), whose sum is σ = 1509080. Its totient is φ = 389424.

The previous prime is 778847. The next prime is 778871. The reversal of 778864 is 468877.

778864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24324 + ... + 24355.

It is an arithmetic number, because the mean of its divisors is an integer number (150908).

2⁷⁷⁸⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

778864 is a deficient number, since it is larger than the sum of its proper divisors (730216).

778864 is a wasteful number, since it uses less digits than its factorization.

778864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48687 (or 48681 counting only the distinct ones).

The product of its digits is 75264, while the sum is 40.

The square root of 778864 is about 882.5327189402. The cubic root of 778864 is about 92.0069307948.

The spelling of 778864 in words is "seven hundred seventy-eight thousand, eight hundred sixty-four".