28531214779 has 2 divisors, whose sum is σ = 28531214780. Its totient is φ = 28531214778.

The previous prime is 28531214773. The next prime is 28531214843. The reversal of 28531214779 is 97741213582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28531214779 - 2⁷ = 28531214651 is a prime.

It is not a weakly prime, because it can be changed into another prime (28531214773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265607389 + 14265607390.

It is an arithmetic number, because the mean of its divisors is an integer number (14265607390).

Almost surely, 2^28531214779 is an apocalyptic number.

28531214779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531214779 is an equidigital number, since it uses as much as digits as its factorization.

28531214779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The spelling of 28531214779 in words is "twenty-eight billion, five hundred thirty-one million, two hundred fourteen thousand, seven hundred seventy-nine".