428645647 has 2 divisors, whose sum is σ = 428645648. Its totient is φ = 428645646.

The previous prime is 428645573. The next prime is 428645653. The reversal of 428645647 is 746546824.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428645647 - 2¹¹ = 428643599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428645597 and 428645606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428645677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214322823 + 214322824.

It is an arithmetic number, because the mean of its divisors is an integer number (214322824).

Almost surely, 2^428645647 is an apocalyptic number.

428645647 is a deficient number, since it is larger than the sum of its proper divisors (1).

428645647 is an equidigital number, since it uses as much as digits as its factorization.

428645647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 46.

The square root of 428645647 is about 20703.7592480206. The cubic root of 428645647 is about 753.9909605682.

The spelling of 428645647 in words is "four hundred twenty-eight million, six hundred forty-five thousand, six hundred forty-seven".