778768 has 10 divisors (see below), whose sum is σ = 1508894. Its totient is φ = 389376.

The previous prime is 778763. The next prime is 778769. The reversal of 778768 is 867877.

It can be written as a sum of positive squares in only one way, i.e., 451584 + 327184 = 672^2 + 572^2 .

It is not an unprimeable number, because it can be changed into a prime (778763) by changing a digit.

778768 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24321 + ... + 24352.

2⁷⁷⁸⁷⁶⁸ is an apocalyptic number.

It is an amenable number.

778768 is a deficient number, since it is larger than the sum of its proper divisors (730126).

778768 is a wasteful number, since it uses less digits than its factorization.

778768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48681 (or 48675 counting only the distinct ones).

The product of its digits is 131712, while the sum is 43.

The square root of 778768 is about 882.4783283458. The cubic root of 778768 is about 92.0031504907.

The spelling of 778768 in words is "seven hundred seventy-eight thousand, seven hundred sixty-eight".