2770840781 has 2 divisors, whose sum is σ = 2770840782. Its totient is φ = 2770840780.

The previous prime is 2770840771. The next prime is 2770840783. The reversal of 2770840781 is 1870480772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2392188100 + 378652681 = 48910^2 + 19459^2 .

It is a cyclic number.

It is not a de Polignac number, because 2770840781 - 2⁶ = 2770840717 is a prime.

It is a super-2 number, since 2×2770840781² = 15355117267305379922, which contains 22 as substring.

Together with 2770840783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2770840783) 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 as a sum of consecutive naturals, namely, 1385420390 + 1385420391.

It is an arithmetic number, because the mean of its divisors is an integer number (1385420391).

Almost surely, 2^2770840781 is an apocalyptic number.

It is an amenable number.

2770840781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2770840781 is an equidigital number, since it uses as much as digits as its factorization.

2770840781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 175616, while the sum is 44.

The square root of 2770840781 is about 52638.7764010525. The cubic root of 2770840781 is about 1404.5499554438.

The spelling of 2770840781 in words is "two billion, seven hundred seventy million, eight hundred forty thousand, seven hundred eighty-one".