28791777019 has 2 divisors, whose sum is σ = 28791777020. Its totient is φ = 28791777018.

The previous prime is 28791777017. The next prime is 28791777029. The reversal of 28791777019 is 91077719782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28791777019 - 2¹ = 28791777017 is a prime.

It is a super-2 number, since 2×28791777019² (a number of 22 digits) contains 22 as substring.

Together with 28791777017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28791777017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14395888509 + 14395888510.

It is an arithmetic number, because the mean of its divisors is an integer number (14395888510).

Almost surely, 2^28791777019 is an apocalyptic number.

28791777019 is a deficient number, since it is larger than the sum of its proper divisors (1).

28791777019 is an equidigital number, since it uses as much as digits as its factorization.

28791777019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3111696, while the sum is 58.

The spelling of 28791777019 in words is "twenty-eight billion, seven hundred ninety-one million, seven hundred seventy-seven thousand, nineteen".