428804647 has 2 divisors, whose sum is σ = 428804648. Its totient is φ = 428804646.

The previous prime is 428804639. The next prime is 428804669. The reversal of 428804647 is 746408824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428804647 - 2³ = 428804639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428804627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214402323 + 214402324.

It is an arithmetic number, because the mean of its divisors is an integer number (214402324).

Almost surely, 2^428804647 is an apocalyptic number.

428804647 is a deficient number, since it is larger than the sum of its proper divisors (1).

428804647 is an equidigital number, since it uses as much as digits as its factorization.

428804647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 344064, while the sum is 43.

The square root of 428804647 is about 20707.5987743630. The cubic root of 428804647 is about 754.0841764475.

The spelling of 428804647 in words is "four hundred twenty-eight million, eight hundred four thousand, six hundred forty-seven".