844778420 has 24 divisors (see below), whose sum is σ = 1779075144. Its totient is φ = 336951296.

The previous prime is 844778419. The next prime is 844778471. The reversal of 844778420 is 24877448.

844778420 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 4 ways, for example, as 12802084 + 831976336 = 3578^2 + 28844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52769 + ... + 66888.

It is an arithmetic number, because the mean of its divisors is an integer number (74128131).

Almost surely, 2^844778420 is an apocalyptic number.

It is an amenable number.

844778420 is an abundant number, since it is smaller than the sum of its proper divisors (934296724).

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

844778420 is a wasteful number, since it uses less digits than its factorization.

844778420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120019 (or 120017 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 44.

The square root of 844778420 is about 29065.0721657456. The cubic root of 844778420 is about 945.3245509535.

The spelling of 844778420 in words is "eight hundred forty-four million, seven hundred seventy-eight thousand, four hundred twenty".