428774779 has 2 divisors, whose sum is σ = 428774780. Its totient is φ = 428774778.

The previous prime is 428774777. The next prime is 428774789. The reversal of 428774779 is 977477824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428774779 - 2¹ = 428774777 is a prime.

It is a super-2 number, since 2×428774779² = 367695622212997682, which contains 22 as substring.

Together with 428774777, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (428774777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214387389 + 214387390.

It is an arithmetic number, because the mean of its divisors is an integer number (214387390).

Almost surely, 2^428774779 is an apocalyptic number.

428774779 is a deficient number, since it is larger than the sum of its proper divisors (1).

428774779 is an equidigital number, since it uses as much as digits as its factorization.

428774779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5531904, while the sum is 55.

The square root of 428774779 is about 20706.8775772689. The cubic root of 428774779 is about 754.0666676904.

The spelling of 428774779 in words is "four hundred twenty-eight million, seven hundred seventy-four thousand, seven hundred seventy-nine".