428804669 has 2 divisors, whose sum is σ = 428804670. Its totient is φ = 428804668.

The previous prime is 428804647. The next prime is 428804671. The reversal of 428804669 is 966408824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315488644 + 113316025 = 17762^2 + 10645^2 .

It is a cyclic number.

It is not a de Polignac number, because 428804669 - 2²⁸ = 160369213 is a prime.

It is a super-2 number, since 2×428804669² = 367746888312399122, which contains 22 as substring.

Together with 428804671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428804639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214402334 + 214402335.

It is an arithmetic number, because the mean of its divisors is an integer number (214402335).

Almost surely, 2^428804669 is an apocalyptic number.

It is an amenable number.

428804669 is a deficient number, since it is larger than the sum of its proper divisors (1).

428804669 is an equidigital number, since it uses as much as digits as its factorization.

428804669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 428804669 is about 20707.5993055690. The cubic root of 428804669 is about 754.0841893437.

The spelling of 428804669 in words is "four hundred twenty-eight million, eight hundred four thousand, six hundred sixty-nine".