8242878779 has 2 divisors, whose sum is σ = 8242878780. Its totient is φ = 8242878778.

The previous prime is 8242878733. The next prime is 8242878781. The reversal of 8242878779 is 9778782428.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8242878779 is a prime.

Together with 8242878781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8242878079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4121439389 + 4121439390.

It is an arithmetic number, because the mean of its divisors is an integer number (4121439390).

Almost surely, 2^8242878779 is an apocalyptic number.

8242878779 is a deficient number, since it is larger than the sum of its proper divisors (1).

8242878779 is an equidigital number, since it uses as much as digits as its factorization.

8242878779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25288704, while the sum is 62.

The square root of 8242878779 is about 90790.3011284796. The cubic root of 8242878779 is about 2020.0384578340.

The spelling of 8242878779 in words is "eight billion, two hundred forty-two million, eight hundred seventy-eight thousand, seven hundred seventy-nine".