428359778069 has 2 divisors, whose sum is σ = 428359778070. Its totient is φ = 428359778068.

The previous prime is 428359778053. The next prime is 428359778107. The reversal of 428359778069 is 960877953824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315136276900 + 113223501169 = 561370^2 + 336487^2 .

It is a cyclic number.

It is not a de Polignac number, because 428359778069 - 2⁴ = 428359778053 is a prime.

It is a super-2 number, since 2×428359778069² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428359778269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214179889034 + 214179889035.

It is an arithmetic number, because the mean of its divisors is an integer number (214179889035).

Almost surely, 2^428359778069 is an apocalyptic number.

It is an amenable number.

428359778069 is a deficient number, since it is larger than the sum of its proper divisors (1).

428359778069 is an equidigital number, since it uses as much as digits as its factorization.

428359778069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 182891520, while the sum is 68.

The spelling of 428359778069 in words is "four hundred twenty-eight billion, three hundred fifty-nine million, seven hundred seventy-eight thousand, sixty-nine".