778916 has 6 divisors (see below), whose sum is σ = 1363110. Its totient is φ = 389456.

The previous prime is 778913. The next prime is 778927. The reversal of 778916 is 619877.

It is a happy number.

778916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 246016 = 730^2 + 496^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 778916.

It is not an unprimeable number, because it can be changed into a prime (778913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97361 + ... + 97368.

It is an arithmetic number, because the mean of its divisors is an integer number (227185).

2⁷⁷⁸⁹¹⁶ is an apocalyptic number.

It is an amenable number.

778916 is a deficient number, since it is larger than the sum of its proper divisors (584194).

778916 is a wasteful number, since it uses less digits than its factorization.

778916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194733 (or 194731 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 778916 is about 882.5621791126. The cubic root of 778916 is about 92.0089783298.

The spelling of 778916 in words is "seven hundred seventy-eight thousand, nine hundred sixteen".