28977632779 has 2 divisors, whose sum is σ = 28977632780. Its totient is φ = 28977632778.

The previous prime is 28977632777. The next prime is 28977632797. The reversal of 28977632779 is 97723677982.

Together with next prime (28977632797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28977632779 - 2¹ = 28977632777 is a prime.

Together with 28977632777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28977632777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14488816389 + 14488816390.

It is an arithmetic number, because the mean of its divisors is an integer number (14488816390).

Almost surely, 2^28977632779 is an apocalyptic number.

28977632779 is a deficient number, since it is larger than the sum of its proper divisors (1).

28977632779 is an equidigital number, since it uses as much as digits as its factorization.

28977632779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112021056, while the sum is 67.

The spelling of 28977632779 in words is "twenty-eight billion, nine hundred seventy-seven million, six hundred thirty-two thousand, seven hundred seventy-nine".