28684764239 has 2 divisors, whose sum is σ = 28684764240. Its totient is φ = 28684764238.

The previous prime is 28684764197. The next prime is 28684764247. The reversal of 28684764239 is 93246748682.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28684764239 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28684764259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14342382119 + 14342382120.

It is an arithmetic number, because the mean of its divisors is an integer number (14342382120).

Almost surely, 2^28684764239 is an apocalyptic number.

28684764239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28684764239 is an equidigital number, since it uses as much as digits as its factorization.

28684764239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27869184, while the sum is 59.

The spelling of 28684764239 in words is "twenty-eight billion, six hundred eighty-four million, seven hundred sixty-four thousand, two hundred thirty-nine".