28781399767 has 2 divisors, whose sum is σ = 28781399768. Its totient is φ = 28781399766.

The previous prime is 28781399743. The next prime is 28781399771. The reversal of 28781399767 is 76799318782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28781399767 - 2¹¹ = 28781397719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28781399167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390699883 + 14390699884.

It is an arithmetic number, because the mean of its divisors is an integer number (14390699884).

Almost surely, 2^28781399767 is an apocalyptic number.

28781399767 is a deficient number, since it is larger than the sum of its proper divisors (1).

28781399767 is an equidigital number, since it uses as much as digits as its factorization.

28781399767 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 67.

The spelling of 28781399767 in words is "twenty-eight billion, seven hundred eighty-one million, three hundred ninety-nine thousand, seven hundred sixty-seven".