428306647 has 2 divisors, whose sum is σ = 428306648. Its totient is φ = 428306646.

The previous prime is 428306639. The next prime is 428306689. The reversal of 428306647 is 746603824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428306647 - 2³ = 428306639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428306147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214153323 + 214153324.

It is an arithmetic number, because the mean of its divisors is an integer number (214153324).

Almost surely, 2^428306647 is an apocalyptic number.

428306647 is a deficient number, since it is larger than the sum of its proper divisors (1).

428306647 is an equidigital number, since it uses as much as digits as its factorization.

428306647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 40.

The square root of 428306647 is about 20695.5707096953. The cubic root of 428306647 is about 753.7921402844.

The spelling of 428306647 in words is "four hundred twenty-eight million, three hundred six thousand, six hundred forty-seven".