28779286793 has 2 divisors, whose sum is σ = 28779286794. Its totient is φ = 28779286792.

The previous prime is 28779286747. The next prime is 28779286799. The reversal of 28779286793 is 39768297782.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22848438649 + 5930848144 = 151157^2 + 77012^2 .

It is a cyclic number.

It is not a de Polignac number, because 28779286793 - 2¹⁶ = 28779221257 is a prime.

It is not a weakly prime, because it can be changed into another prime (28779286799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389643396 + 14389643397.

It is an arithmetic number, because the mean of its divisors is an integer number (14389643397).

Almost surely, 2^28779286793 is an apocalyptic number.

It is an amenable number.

28779286793 is a deficient number, since it is larger than the sum of its proper divisors (1).

28779286793 is an equidigital number, since it uses as much as digits as its factorization.

28779286793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128024064, while the sum is 68.

The spelling of 28779286793 in words is "twenty-eight billion, seven hundred seventy-nine million, two hundred eighty-six thousand, seven hundred ninety-three".