778420 has 12 divisors (see below), whose sum is σ = 1634724. Its totient is φ = 311360.

The previous prime is 778417. The next prime is 778439. The reversal of 778420 is 24877.

778420 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 2 ways, for example, as 79524 + 698896 = 282^2 + 836^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19441 + ... + 19480.

It is an arithmetic number, because the mean of its divisors is an integer number (136227).

2⁷⁷⁸⁴²⁰ is an apocalyptic number.

It is an amenable number.

778420 is an abundant number, since it is smaller than the sum of its proper divisors (856304).

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

778420 is a wasteful number, since it uses less digits than its factorization.

778420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38930 (or 38928 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 778420 is about 882.2811343330. The cubic root of 778420 is about 91.9894442836.

The spelling of 778420 in words is "seven hundred seventy-eight thousand, four hundred twenty".