778798 has 4 divisors (see below), whose sum is σ = 1168200. Its totient is φ = 389398.

The previous prime is 778793. The next prime is 778819. The reversal of 778798 is 897877.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778793) 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 as a sum of consecutive naturals, namely, 194698 + ... + 194701.

It is an arithmetic number, because the mean of its divisors is an integer number (292050).

2⁷⁷⁸⁷⁹⁸ is an apocalyptic number.

778798 is a deficient number, since it is larger than the sum of its proper divisors (389402).

778798 is a wasteful number, since it uses less digits than its factorization.

778798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389401.

The product of its digits is 197568, while the sum is 46.

The square root of 778798 is about 882.4953257667. The cubic root of 778798 is about 92.0043318691.

The spelling of 778798 in words is "seven hundred seventy-eight thousand, seven hundred ninety-eight".