2778872077 has 2 divisors, whose sum is σ = 2778872078. Its totient is φ = 2778872076.

The previous prime is 2778872059. The next prime is 2778872081. The reversal of 2778872077 is 7702788772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2657299401 + 121572676 = 51549^2 + 11026^2 .

It is a cyclic number.

It is not a de Polignac number, because 2778872077 - 2¹⁵ = 2778839309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2778870077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389436038 + 1389436039.

It is an arithmetic number, because the mean of its divisors is an integer number (1389436039).

Almost surely, 2^2778872077 is an apocalyptic number.

It is an amenable number.

2778872077 is a deficient number, since it is larger than the sum of its proper divisors (1).

2778872077 is an equidigital number, since it uses as much as digits as its factorization.

2778872077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4302592, while the sum is 55.

The square root of 2778872077 is about 52715.0080811907. The cubic root of 2778872077 is about 1405.9056781434.

The spelling of 2778872077 in words is "two billion, seven hundred seventy-eight million, eight hundred seventy-two thousand, seventy-seven".