778868 has 6 divisors (see below), whose sum is σ = 1363026. Its totient is φ = 389432.

The previous prime is 778847. The next prime is 778871. The reversal of 778868 is 868877.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 574564 + 204304 = 758^2 + 452^2 .

It is a super-2 number, since 2×778868² = 1213270722848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

778868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 97355 + ... + 97362.

It is an arithmetic number, because the mean of its divisors is an integer number (227171).

2⁷⁷⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

778868 is a deficient number, since it is larger than the sum of its proper divisors (584158).

778868 is a wasteful number, since it uses less digits than its factorization.

778868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194721 (or 194719 counting only the distinct ones).

The product of its digits is 150528, while the sum is 44.

The square root of 778868 is about 882.5349851422. The cubic root of 778868 is about 92.0070883007.

Subtracting 778868 from its reverse (868877), we obtain a palindrome (90009).

The spelling of 778868 in words is "seven hundred seventy-eight thousand, eight hundred sixty-eight".