2780028109 has 2 divisors, whose sum is σ = 2780028110. Its totient is φ = 2780028108.

The previous prime is 2780028107. The next prime is 2780028151. The reversal of 2780028109 is 9018200872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2512214884 + 267813225 = 50122^2 + 16365^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780028109 - 2¹ = 2780028107 is a prime.

Together with 2780028107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780028107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390014054 + 1390014055.

It is an arithmetic number, because the mean of its divisors is an integer number (1390014055).

Almost surely, 2^2780028109 is an apocalyptic number.

It is an amenable number.

2780028109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780028109 is an equidigital number, since it uses as much as digits as its factorization.

2780028109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 2780028109 is about 52725.9718639685. The cubic root of 2780028109 is about 1406.1006069472.

The spelling of 2780028109 in words is "two billion, seven hundred eighty million, twenty-eight thousand, one hundred nine".