2781056745 has 24 divisors (see below), whose sum is σ = 4902206400. Its totient is φ = 1458089376.

The previous prime is 2781056743. The next prime is 2781056783. The reversal of 2781056745 is 5476501872.

2781056745 is a `hidden beast` number, since 2 + 7 + 81 + 0 + 567 + 4 + 5 = 666.

It is not a de Polignac number, because 2781056745 - 2¹ = 2781056743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2781056745.

It is not an unprimeable number, because it can be changed into a prime (2781056743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 521085 + ... + 526394.

It is an arithmetic number, because the mean of its divisors is an integer number (204258600).

Almost surely, 2^2781056745 is an apocalyptic number.

It is an amenable number.

2781056745 is a deficient number, since it is larger than the sum of its proper divisors (2121149655).

2781056745 is a wasteful number, since it uses less digits than its factorization.

2781056745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047549 (or 1047546 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The square root of 2781056745 is about 52735.7255093736. The cubic root of 2781056745 is about 1406.2740089531.

The spelling of 2781056745 in words is "two billion, seven hundred eighty-one million, fifty-six thousand, seven hundred forty-five".