428106643 has 4 divisors (see below), whose sum is σ = 432916920. Its totient is φ = 423296368.

The previous prime is 428106629. The next prime is 428106649. The reversal of 428106643 is 346601824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428106643 - 2⁵ = 428106611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428106599 and 428106608.

It is not an unprimeable number, because it can be changed into a prime (428106649) 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 3 ways as a sum of consecutive naturals, for example, 2405005 + ... + 2405182.

It is an arithmetic number, because the mean of its divisors is an integer number (108229230).

Almost surely, 2^428106643 is an apocalyptic number.

428106643 is a deficient number, since it is larger than the sum of its proper divisors (4810277).

428106643 is an equidigital number, since it uses as much as digits as its factorization.

428106643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4810276.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 428106643 is about 20690.7380970327. The cubic root of 428106643 is about 753.6747906261.

The spelling of 428106643 in words is "four hundred twenty-eight million, one hundred six thousand, six hundred forty-three".