428347687 has 2 divisors, whose sum is σ = 428347688. Its totient is φ = 428347686.

The previous prime is 428347679. The next prime is 428347697. The reversal of 428347687 is 786743824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428347687 - 2³ = 428347679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428347687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428347637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214173843 + 214173844.

It is an arithmetic number, because the mean of its divisors is an integer number (214173844).

Almost surely, 2^428347687 is an apocalyptic number.

428347687 is a deficient number, since it is larger than the sum of its proper divisors (1).

428347687 is an equidigital number, since it uses as much as digits as its factorization.

428347687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 49.

The square root of 428347687 is about 20696.5622024529. The cubic root of 428347687 is about 753.8162154353.

The spelling of 428347687 in words is "four hundred twenty-eight million, three hundred forty-seven thousand, six hundred eighty-seven".