778404 has 24 divisors (see below), whose sum is σ = 1981728. Its totient is φ = 235840.

The previous prime is 778403. The next prime is 778409. The reversal of 778404 is 404877.

It is not an unprimeable number, because it can be changed into a prime (778403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2817 + ... + 3080.

It is an arithmetic number, because the mean of its divisors is an integer number (82572).

2⁷⁷⁸⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

778404 is an abundant number, since it is smaller than the sum of its proper divisors (1203324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778404 is a wasteful number, since it uses less digits than its factorization.

778404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5915 (or 5913 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 778404 is about 882.2720668819. The cubic root of 778404 is about 91.9888140149.

The spelling of 778404 in words is "seven hundred seventy-eight thousand, four hundred four".