28721999279 has 2 divisors, whose sum is σ = 28721999280. Its totient is φ = 28721999278.

The previous prime is 28721999203. The next prime is 28721999281. The reversal of 28721999279 is 97299912782.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28721999279 is a prime.

Together with 28721999281, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28721999479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14360999639 + 14360999640.

It is an arithmetic number, because the mean of its divisors is an integer number (14360999640).

Almost surely, 2^28721999279 is an apocalyptic number.

28721999279 is a deficient number, since it is larger than the sum of its proper divisors (1).

28721999279 is an equidigital number, since it uses as much as digits as its factorization.

28721999279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20575296, while the sum is 65.

The spelling of 28721999279 in words is "twenty-eight billion, seven hundred twenty-one million, nine hundred ninety-nine thousand, two hundred seventy-nine".