2781428 has 24 divisors (see below), whose sum is σ = 5309640. Its totient is φ = 1267200.

The previous prime is 2781397. The next prime is 2781433. The reversal of 2781428 is 8241872.

2781428 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 131044 + 2650384 = 362^2 + 1628^2 .

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 2781394 and 2781403.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 4328 + ... + 4928.

It is an arithmetic number, because the mean of its divisors is an integer number (221235).

2^2781428 is an apocalyptic number.

It is an amenable number.

2781428 is a deficient number, since it is larger than the sum of its proper divisors (2528212).

2781428 is a wasteful number, since it uses less digits than its factorization.

2781428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 705 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 2781428 is about 1667.7613738182. The cubic root of 2781428 is about 140.6336582653.

The spelling of 2781428 in words is "two million, seven hundred eighty-one thousand, four hundred twenty-eight".