2778436 has 6 divisors (see below), whose sum is σ = 4862270. Its totient is φ = 1389216.

The previous prime is 2778421. The next prime is 2778439. The reversal of 2778436 is 6348772.

It can be written as a sum of positive squares in only one way, i.e., 2742336 + 36100 = 1656^2 + 190^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2778395 and 2778404.

It is not an unprimeable number, because it can be changed into a prime (2778439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347301 + ... + 347308.

2^2778436 is an apocalyptic number.

It is an amenable number.

2778436 is a deficient number, since it is larger than the sum of its proper divisors (2083834).

2778436 is a wasteful number, since it uses less digits than its factorization.

2778436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694613 (or 694611 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 2778436 is about 1666.8641216368. The cubic root of 2778436 is about 140.5832133292.

The spelling of 2778436 in words is "two million, seven hundred seventy-eight thousand, four hundred thirty-six".