428907689 has 8 divisors (see below), whose sum is σ = 490325760. Its totient is φ = 367526016.

The previous prime is 428907679. The next prime is 428907733. The reversal of 428907689 is 986709824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428907689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428907689.

It is not an unprimeable number, because it can be changed into a prime (428907679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24377 + ... + 38105.

It is an arithmetic number, because the mean of its divisors is an integer number (61290720).

Almost surely, 2^428907689 is an apocalyptic number.

It is an amenable number.

428907689 is a deficient number, since it is larger than the sum of its proper divisors (61418071).

428907689 is a wasteful number, since it uses less digits than its factorization.

428907689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18199.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 428907689 is about 20710.0866487806. The cubic root of 428907689 is about 754.1445738950.

The spelling of 428907689 in words is "four hundred twenty-eight million, nine hundred seven thousand, six hundred eighty-nine".