428420643 has 16 divisors (see below), whose sum is σ = 653381376. Its totient is φ = 244605600.

The previous prime is 428420627. The next prime is 428420711. The reversal of 428420643 is 346024824.

It is not a de Polignac number, because 428420643 - 2⁴ = 428420627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428420143) 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 15 ways as a sum of consecutive naturals, for example, 18993 + ... + 34893.

It is an arithmetic number, because the mean of its divisors is an integer number (40836336).

Almost surely, 2^428420643 is an apocalyptic number.

428420643 is a deficient number, since it is larger than the sum of its proper divisors (224960733).

428420643 is a wasteful number, since it uses less digits than its factorization.

428420643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17194.

The product of its (nonzero) digits is 36864, while the sum is 33.

The square root of 428420643 is about 20698.3246423473. The cubic root of 428420643 is about 753.8590095606.

The spelling of 428420643 in words is "four hundred twenty-eight million, four hundred twenty thousand, six hundred forty-three".