2781028 has 6 divisors (see below), whose sum is σ = 4866806. Its totient is φ = 1390512.

The previous prime is 2781019. The next prime is 2781029. The reversal of 2781028 is 8201872.

2781028 is digitally balanced in base 5, 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 only one way, i.e., 2585664 + 195364 = 1608^2 + 442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2780987 and 2781005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347625 + ... + 347632.

2^2781028 is an apocalyptic number.

It is an amenable number.

2781028 is a deficient number, since it is larger than the sum of its proper divisors (2085778).

2781028 is a wasteful number, since it uses less digits than its factorization.

2781028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695261 (or 695259 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 2781028 is about 1667.6414482736. The cubic root of 2781028 is about 140.6269163854.

The spelling of 2781028 in words is "two million, seven hundred eighty-one thousand, twenty-eight".