9726428779 has 2 divisors, whose sum is σ = 9726428780. Its totient is φ = 9726428778.

The previous prime is 9726428759. The next prime is 9726428819. The reversal of 9726428779 is 9778246279.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9726428779 - 2⁹ = 9726428267 is a prime.

It is not a weakly prime, because it can be changed into another prime (9726428759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4863214389 + 4863214390.

It is an arithmetic number, because the mean of its divisors is an integer number (4863214390).

Almost surely, 2^9726428779 is an apocalyptic number.

9726428779 is a deficient number, since it is larger than the sum of its proper divisors (1).

9726428779 is an equidigital number, since it uses as much as digits as its factorization.

9726428779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 61.

The square root of 9726428779 is about 98622.6585476177. The cubic root of 9726428779 is about 2134.6063827261.

The spelling of 9726428779 in words is "nine billion, seven hundred twenty-six million, four hundred twenty-eight thousand, seven hundred seventy-nine".