2780749369 has 2 divisors, whose sum is σ = 2780749370. Its totient is φ = 2780749368.

The previous prime is 2780749333. The next prime is 2780749373. The reversal of 2780749369 is 9639470872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1441189369 + 1339560000 = 37963^2 + 36600^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780749369 - 2¹⁷ = 2780618297 is a prime.

It is a super-2 number, since 2×2780749369² = 15465134106387796322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2780749399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390374684 + 1390374685.

It is an arithmetic number, because the mean of its divisors is an integer number (1390374685).

Almost surely, 2^2780749369 is an apocalyptic number.

It is an amenable number.

2780749369 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780749369 is an equidigital number, since it uses as much as digits as its factorization.

2780749369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4572288, while the sum is 55.

The square root of 2780749369 is about 52732.8111236259. The cubic root of 2780749369 is about 1406.2221976159. Note that the first 3 decimals are identical.

The spelling of 2780749369 in words is "two billion, seven hundred eighty million, seven hundred forty-nine thousand, three hundred sixty-nine".