428345643 has 16 divisors (see below), whose sum is σ = 624433536. Its totient is φ = 259026240.

The previous prime is 428345623. The next prime is 428345669. The reversal of 428345643 is 346543824.

It is not a de Polignac number, because 428345643 - 2⁵ = 428345611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428345623) 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 in 15 ways as a sum of consecutive naturals, for example, 880 + ... + 29282.

It is an arithmetic number, because the mean of its divisors is an integer number (39027096).

Almost surely, 2^428345643 is an apocalyptic number.

428345643 is a deficient number, since it is larger than the sum of its proper divisors (196087893).

428345643 is a wasteful number, since it uses less digits than its factorization.

428345643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28874.

The product of its digits is 276480, while the sum is 39.

The square root of 428345643 is about 20696.5128222123. The cubic root of 428345643 is about 753.8150164071.

The spelling of 428345643 in words is "four hundred twenty-eight million, three hundred forty-five thousand, six hundred forty-three".