428517787 has 2 divisors, whose sum is σ = 428517788. Its totient is φ = 428517786.

The previous prime is 428517781. The next prime is 428517839. The reversal of 428517787 is 787715824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428517787 - 2¹¹ = 428515739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428517787.

It is not a weakly prime, because it can be changed into another prime (428517781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214258893 + 214258894.

It is an arithmetic number, because the mean of its divisors is an integer number (214258894).

Almost surely, 2^428517787 is an apocalyptic number.

428517787 is a deficient number, since it is larger than the sum of its proper divisors (1).

428517787 is an equidigital number, since it uses as much as digits as its factorization.

428517787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 878080, while the sum is 49.

The square root of 428517787 is about 20700.6711726939. The cubic root of 428517787 is about 753.9159842080.

The spelling of 428517787 in words is "four hundred twenty-eight million, five hundred seventeen thousand, seven hundred eighty-seven".